Utility to change the target script of a component

EditorUtils.cs

using UnityEditor;
using UnityEngine;

public static class EditorUtils
{
	/// <summary>
	/// Verify whether it can be converted to the specified component.
	/// </summary>
	public static bool CanConvertTo<T>(Object context) where T : MonoBehaviour
	{
		return context && context.GetType() != typeof(T);
	}

	/// <summary>
	/// Convert to the specified component.
	/// </summary>
	public static void ConvertTo<T>(Object context) where T : MonoBehaviour
	{
		var target = context as MonoBehaviour;
		var so = new SerializedObject(target);
		so.Update();

		var oldEnable = target.enabled;
		target.enabled = false;

		// Find MonoScript of the specified component.
		foreach (var script in Resources.FindObjectsOfTypeAll<MonoScript>())
		{
			if (script.GetClass() != typeof(T))
				continue;

			// Set 'm_Script' to convert.
			so.FindProperty("m_Script").objectReferenceValue = script;
			so.ApplyModifiedProperties();
			break;
		}

		(so.targetObject as MonoBehaviour).enabled = oldEnable;
	}
}