Is there any event or delegate that is called with OnValidate() ?

I try to implement system that will make possible to connect Components with related for them editor-only Game Object - for showing and controlling some state of Component visually (geometry forms, joints, et.c). I know that ordinary system for doing t$$anonymous$$s is Gizmos Draw, but Gizmos have no Z-sorting and is not so functional as Game Objects.
.
Mentioned editor-only objects should track in-Editor changes of connected Components state with as little amount of glue code as possible. I thought there is some delegate or event like OnValidate() that allow subscribe for Component state changes in Editor Mode. But it looks like it's not possible.
.
So it looks like the only way is to make some utility class (somet$$anonymous$$ng like "MonoBehaviourWithEditMode"), inherit it from MonoBehaviour and implement event there by ourselves. Then t$$anonymous$$s class may be used as base for Components that what to notify somebody about changes?... Bulky and not flexable.
.
So, the question: is there some more sutable way to implement wanted functionality?