diff --git a/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp b/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
index 2c510fb394..9d354a4b8e 100644
--- a/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/EmuSubroutines.cpp
@@ -602,9 +602,9 @@ ExtensionNumber Wiimote::GetActiveExtensionNumber() const
   return m_active_extension;
 }
 
-bool Wiimote::IsMotionPlusAttached() const
+ControllerEmu::SubscribableSettingValue<bool>& Wiimote::GetMotionPlusSetting()
 {
-  return m_is_motion_plus_attached;
+  return m_motion_plus_setting;
 }
 
 }  // namespace WiimoteEmu
diff --git a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h
index e364ccdb6c..e50a6efbc9 100644
--- a/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h
+++ b/Source/Core/Core/HW/WiimoteEmu/WiimoteEmu.h
@@ -173,7 +173,7 @@ public:
 
   // Active extension number is exposed for TAS.
   ExtensionNumber GetActiveExtensionNumber() const;
-  bool IsMotionPlusAttached() const;
+  ControllerEmu::SubscribableSettingValue<bool>& GetMotionPlusSetting();
 
   static Common::Vec3
   OverrideVec3(const ControllerEmu::ControlGroup* control_group, Common::Vec3 vec,
@@ -308,7 +308,7 @@ private:
   ControllerEmu::SettingValue<bool> m_sideways_setting;
   ControllerEmu::SettingValue<bool> m_upright_setting;
   ControllerEmu::SettingValue<double> m_battery_setting;
-  ControllerEmu::SettingValue<bool> m_motion_plus_setting;
+  ControllerEmu::SubscribableSettingValue<bool> m_motion_plus_setting;
   ControllerEmu::SettingValue<double> m_fov_x_setting;
   ControllerEmu::SettingValue<double> m_fov_y_setting;
 
diff --git a/Source/Core/DolphinQt/TAS/WiiTASInputWindow.cpp b/Source/Core/DolphinQt/TAS/WiiTASInputWindow.cpp
index 08c3431fd8..5afe374608 100644
--- a/Source/Core/DolphinQt/TAS/WiiTASInputWindow.cpp
+++ b/Source/Core/DolphinQt/TAS/WiiTASInputWindow.cpp
@@ -347,32 +347,6 @@ WiiTASInputWindow::WiiTASInputWindow(QWidget* parent, int num) : TASInputWindow(
   layout->addWidget(m_settings_box);
 
   setLayout(layout);
-
-  if (Core::IsRunning(Core::System::GetInstance()))
-  {
-    m_active_extension = GetWiimote()->GetActiveExtensionNumber();
-    m_is_motion_plus_attached = GetWiimote()->IsMotionPlusAttached();
-  }
-  else
-  {
-    Common::IniFile ini;
-    ini.Load(File::GetUserPath(D_CONFIG_IDX) + "WiimoteNew.ini");
-    const std::string section_name = "Wiimote" + std::to_string(num + 1);
-
-    std::string extension;
-    ini.GetIfExists(section_name, "Extension", &extension);
-
-    if (extension == "Nunchuk")
-      m_active_extension = WiimoteEmu::ExtensionNumber::NUNCHUK;
-    else if (extension == "Classic")
-      m_active_extension = WiimoteEmu::ExtensionNumber::CLASSIC;
-    else
-      m_active_extension = WiimoteEmu::ExtensionNumber::NONE;
-
-    m_is_motion_plus_attached = true;
-    ini.GetIfExists(section_name, "Extension/Attach MotionPlus", &m_is_motion_plus_attached);
-  }
-  UpdateExt();
 }
 
 WiimoteEmu::Wiimote* WiiTASInputWindow::GetWiimote()
@@ -392,7 +366,71 @@ WiimoteEmu::Extension* WiiTASInputWindow::GetExtension()
       GetAttachments()->GetAttachmentList()[m_active_extension].get());
 }
 
-void WiiTASInputWindow::UpdateExt()
+void WiiTASInputWindow::UpdateExtension(const int extension)
+{
+  const auto new_extension = static_cast<WiimoteEmu::ExtensionNumber>(extension);
+  if (new_extension == m_active_extension)
+    return;
+
+  m_active_extension = new_extension;
+
+  UpdateControlVisibility();
+  UpdateInputOverrideFunction();
+}
+
+void WiiTASInputWindow::UpdateMotionPlus(const bool attached)
+{
+  if (attached == m_is_motion_plus_attached)
+    return;
+
+  m_is_motion_plus_attached = attached;
+
+  UpdateControlVisibility();
+}
+
+void WiiTASInputWindow::LoadExtensionAndMotionPlus()
+{
+  WiimoteEmu::Wiimote* const wiimote = GetWiimote();
+
+  if (Core::IsRunning(Core::System::GetInstance()))
+  {
+    m_active_extension = wiimote->GetActiveExtensionNumber();
+    m_is_motion_plus_attached = wiimote->GetMotionPlusSetting().GetValue();
+  }
+  else
+  {
+    Common::IniFile ini;
+    ini.Load(File::GetUserPath(D_CONFIG_IDX) + "WiimoteNew.ini");
+    const std::string section_name = "Wiimote" + std::to_string(m_num + 1);
+
+    std::string extension;
+    ini.GetIfExists(section_name, "Extension", &extension);
+
+    if (extension == "Nunchuk")
+      m_active_extension = WiimoteEmu::ExtensionNumber::NUNCHUK;
+    else if (extension == "Classic")
+      m_active_extension = WiimoteEmu::ExtensionNumber::CLASSIC;
+    else
+      m_active_extension = WiimoteEmu::ExtensionNumber::NONE;
+
+    m_is_motion_plus_attached = true;
+    ini.GetIfExists(section_name, "Extension/Attach MotionPlus", &m_is_motion_plus_attached);
+  }
+
+  UpdateControlVisibility();
+  UpdateInputOverrideFunction();
+
+  m_motion_plus_callback_id =
+      wiimote->GetMotionPlusSetting().AddCallback([this](const bool attached) {
+        QueueOnObject(this, [this, attached] { UpdateMotionPlus(attached); });
+      });
+  m_attachment_callback_id =
+      GetAttachments()->GetAttachmentSetting().AddCallback([this](const int extension_index) {
+        QueueOnObject(this, [this, extension_index] { UpdateExtension(extension_index); });
+      });
+}
+
+void WiiTASInputWindow::UpdateControlVisibility()
 {
   if (m_active_extension == WiimoteEmu::ExtensionNumber::NUNCHUK)
   {
@@ -451,17 +489,36 @@ void WiiTASInputWindow::UpdateExt()
     m_nunchuk_buttons_box->hide();
     m_classic_buttons_box->hide();
   }
+
+  // Without these calls, switching between attachments can result in the Stick/IRWidgets being
+  // surrounded by large amounts of empty space in one dimension.
+  adjustSize();
+  resize(sizeHint());
 }
 
-void WiiTASInputWindow::hideEvent(QHideEvent* event)
+void WiiTASInputWindow::hideEvent(QHideEvent* const event)
 {
-  GetWiimote()->ClearInputOverrideFunction();
+  WiimoteEmu::Wiimote* const wiimote = GetWiimote();
+
+  wiimote->ClearInputOverrideFunction();
+  wiimote->GetMotionPlusSetting().RemoveCallback(m_motion_plus_callback_id);
+
   GetExtension()->ClearInputOverrideFunction();
+  GetAttachments()->GetAttachmentSetting().RemoveCallback(m_attachment_callback_id);
+
+  TASInputWindow::hideEvent(event);
 }
 
-void WiiTASInputWindow::showEvent(QShowEvent* event)
+void WiiTASInputWindow::showEvent(QShowEvent* const event)
 {
-  WiimoteEmu::Wiimote* wiimote = GetWiimote();
+  LoadExtensionAndMotionPlus();
+
+  TASInputWindow::showEvent(event);
+}
+
+void WiiTASInputWindow::UpdateInputOverrideFunction()
+{
+  WiimoteEmu::Wiimote* const wiimote = GetWiimote();
 
   if (m_active_extension != WiimoteEmu::ExtensionNumber::CLASSIC)
     wiimote->SetInputOverrideFunction(m_wiimote_overrider.GetInputOverrideFunction());
diff --git a/Source/Core/DolphinQt/TAS/WiiTASInputWindow.h b/Source/Core/DolphinQt/TAS/WiiTASInputWindow.h
index a77c38bb4c..a7a413e864 100644
--- a/Source/Core/DolphinQt/TAS/WiiTASInputWindow.h
+++ b/Source/Core/DolphinQt/TAS/WiiTASInputWindow.h
@@ -34,15 +34,22 @@ public:
   void hideEvent(QHideEvent* event) override;
   void showEvent(QShowEvent* event) override;
 
+  void UpdateExtension(int extension);
+  void UpdateMotionPlus(bool attached);
+
 private:
   WiimoteEmu::Wiimote* GetWiimote();
   ControllerEmu::Attachments* GetAttachments();
   WiimoteEmu::Extension* GetExtension();
 
-  void UpdateExt();
+  void LoadExtensionAndMotionPlus();
+  void UpdateControlVisibility();
+  void UpdateInputOverrideFunction();
 
   WiimoteEmu::ExtensionNumber m_active_extension;
+  int m_attachment_callback_id = -1;
   bool m_is_motion_plus_attached;
+  int m_motion_plus_callback_id = -1;
   int m_num;
 
   InputOverrider m_wiimote_overrider;
diff --git a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.cpp b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.cpp
index 42e1acff5b..b4bb1699c0 100644
--- a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.cpp
+++ b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.cpp
@@ -35,6 +35,11 @@ NumericSetting<int>& Attachments::GetSelectionSetting()
   return m_selection_setting;
 }
 
+SubscribableSettingValue<int>& Attachments::GetAttachmentSetting()
+{
+  return m_selection_value;
+}
+
 const std::vector<std::unique_ptr<EmulatedController>>& Attachments::GetAttachmentList() const
 {
   return m_attachments;
diff --git a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h
index 7553639396..887231196b 100644
--- a/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h
+++ b/Source/Core/InputCommon/ControllerEmu/ControlGroup/Attachments.h
@@ -29,11 +29,12 @@ public:
   void SetSelectedAttachment(u32 val);
 
   NumericSetting<int>& GetSelectionSetting();
+  SubscribableSettingValue<int>& GetAttachmentSetting();
 
   const std::vector<std::unique_ptr<EmulatedController>>& GetAttachmentList() const;
 
 private:
-  SettingValue<int> m_selection_value;
+  SubscribableSettingValue<int> m_selection_value;
   // This is here and not added to the list of numeric_settings because it's serialized differently,
   // by string (to be independent from the enum), and visualized differently in the UI.
   // For the rest, it's treated similarly to other numeric_settings in the group.
diff --git a/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h b/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h
index 863e211cae..dbe52576e4 100644
--- a/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h
+++ b/Source/Core/InputCommon/ControllerEmu/Setting/NumericSetting.h
@@ -3,8 +3,13 @@
 
 #pragma once
 
+#include <algorithm>
 #include <atomic>
+#include <functional>
+#include <mutex>
 #include <string>
+#include <utility>
+#include <vector>
 
 #include "Common/CommonTypes.h"
 #include "Common/IniFile.h"
@@ -173,7 +178,9 @@ class SettingValue
   friend class NumericSetting<T>;
 
 public:
-  ValueType GetValue() const
+  virtual ~SettingValue() = default;
+
+  virtual ValueType GetValue() const
   {
     // Only update dynamic values when the input gate is enabled.
     // Otherwise settings will all change to 0 when window focus is lost.
@@ -184,9 +191,11 @@ public:
     return m_value;
   }
 
+  ValueType GetCachedValue() const { return m_value; }
+
   bool IsSimpleValue() const { return m_input.GetExpression().empty(); }
 
-  void SetValue(ValueType value)
+  virtual void SetValue(const ValueType value)
   {
     m_value = value;
 
@@ -202,4 +211,78 @@ private:
   mutable InputReference m_input;
 };
 
+template <typename ValueType>
+class SubscribableSettingValue final : public SettingValue<ValueType>
+{
+public:
+  using Base = SettingValue<ValueType>;
+
+  ValueType GetValue() const override
+  {
+    const ValueType cached_value = GetCachedValue();
+    if (IsSimpleValue())
+      return cached_value;
+
+    const ValueType updated_value = Base::GetValue();
+    if (updated_value != cached_value)
+      TriggerCallbacks();
+
+    return updated_value;
+  }
+
+  void SetValue(const ValueType value) override
+  {
+    if (value != GetCachedValue())
+    {
+      Base::SetValue(value);
+      TriggerCallbacks();
+    }
+    else if (!IsSimpleValue())
+    {
+      // The setting has an expression with a cached value equal to the one currently being set.
+      // Don't trigger the callbacks (since the value didn't change), but clear the expression and
+      // make the setting a simple value instead.
+      Base::SetValue(value);
+    }
+  }
+
+  ValueType GetCachedValue() const { return Base::GetCachedValue(); }
+  bool IsSimpleValue() const { return Base::IsSimpleValue(); }
+
+  using SettingChangedCallback = std::function<void(ValueType)>;
+
+  int AddCallback(const SettingChangedCallback& callback)
+  {
+    std::lock_guard lock(m_mutex);
+    const int callback_id = m_next_callback_id;
+    ++m_next_callback_id;
+    m_callback_pairs.emplace_back(callback_id, callback);
+
+    return callback_id;
+  }
+
+  void RemoveCallback(const int id)
+  {
+    std::lock_guard lock(m_mutex);
+    const auto iter = std::ranges::find(m_callback_pairs, id, &IDCallbackPair::first);
+    if (iter != m_callback_pairs.end())
+      m_callback_pairs.erase(iter);
+  }
+
+private:
+  void TriggerCallbacks() const
+  {
+    std::lock_guard lock(m_mutex);
+    const ValueType value = Base::GetValue();
+    for (const auto& pair : m_callback_pairs)
+      pair.second(value);
+  }
+
+  using IDCallbackPair = std::pair<int, SettingChangedCallback>;
+  std::vector<IDCallbackPair> m_callback_pairs;
+  int m_next_callback_id = 0;
+
+  mutable std::mutex m_mutex;
+};
+
 }  // namespace ControllerEmu