Custom Tweak Propertie Attribute Add Button to Inspector w/out complete CustomInspector (put InspectorButtonPropertyDrawer.cs inside an Editor folder)

InspectorButtonAttribute.cs

using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif

// format from this thread : https://www.reddit.com/r/Unity3D/comments/1s6czv/inspectorbutton_add_a_custom_button_to_your/

[System.AttributeUsage(System.AttributeTargets.Field)]
public class InspectorButtonAttribute : PropertyAttribute
{
	public const float DefaultButtonWidth = 80f;

	public string MethodName;

	public float ButtonWidth = DefaultButtonWidth;
	
	public InspectorButtonAttribute(string MethodName, float ButtonWidth = DefaultButtonWidth)
	{
		this.MethodName = MethodName;

		this.ButtonWidth = ButtonWidth;

	}// InspectorButtonAttribute()

}// class InspectorButtonAttribute : PropertyAttribute

InspectorButtonPropertyDrawer.cs

using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif
using System.Reflection;

// put this script inside an Editor folder.

#if UNITY_EDITOR
[CustomPropertyDrawer(typeof(InspectorButtonAttribute))]
public class InspectorButtonPropertyDrawer : PropertyDrawer
{
	private MethodInfo _eventMethodInfo = null;

	public override void OnGUI(Rect position, SerializedProperty prop, GUIContent label)
	{
		InspectorButtonAttribute inspectorButtonAttribute =(InspectorButtonAttribute)attribute;

		Rect buttonRect = new Rect(position.x + (position.width - inspectorButtonAttribute.ButtonWidth) * 0.5f, position.y, inspectorButtonAttribute.ButtonWidth, position.height);

		if(GUI.Button(buttonRect, label.text))
		{
			System.Type eventOwnerType = prop.serializedObject.targetObject.GetType();

			string eventName = inspectorButtonAttribute.MethodName;

			if(_eventMethodInfo == null)
				_eventMethodInfo = eventOwnerType.GetMethod(eventName, BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);

			if(_eventMethodInfo != null)
				_eventMethodInfo.Invoke(prop.serializedObject.targetObject, null);
			else
				Debug.LogWarning(string.Format("InspectorButton: Unable to find method {0} in {1}", eventName, eventOwnerType));
		}

	}// OnGUI()

}// class InspectorButtonPropertyDrawer : PropertyDrawer
#endif// UNITY_EDITOR

InspectorButtonTest.cs

using UnityEngine;


public class InspectorButtonTest : MonoBehaviour
{
	[InspectorButton("ToggleEnable")]
	public bool switchEnable = false;

	private void Start() { }

	private void ToggleEnable()
	{
		enabled = !enabled;

	}// ToggleEnable()

}// class InspectorButtonTest : MonoBehaviour