Replace [ExecuteInEditMode] to a fully Editor Way

Hello I have an editor question: I have a script MyScript, with the attribute [ExecuteInEditMode], I use it to use the Awake(), and Update() of the Monobehaviour also in editor.

But I would like the clean version of it, I don't like to have editor code inside monobehaviour. So I created an MyScriptEditor. Now my question is: How to trigger a custom Awake / update fonction inside the editor script ? (WITHOUT the gameObject behing selected!).

The OnEnable / OnDisable function of an editor script are triggered when the gameObject containing the script is selected once.

Thanks!