[Request]Paint fast deeply nested geometry

[Einstein]

Hi!

I put a similar post to SketchUp community. I'd have a plugin request. I believe it would be simple and very helpful.

I need a method to instantly paint etities within groups, within another groups etc.
I tried Fredo Thru Paint but it doesn’t manage multiple grups at once. I have lots of groups nested in one huge parent group and would like to paint it entirely with one material, as quick as possible, not having to enter each group one by one.
The groups already have multiple materials applied so it’ll be surely impossible with SU native tools. I know it’s normally impossible to override material as one has been already applied to geometry. But maybe a plugin?