@Norbert_X this is brilliant! I will give it a try on my side as soon as I get a chance.
It would be great!
Off topic question, what's your host system with the orange-brown old-school looking title bar?
On host I'm using Ubuntu MATE 16.04.5 LTS with Human-Clearlooks theme (from human-theme official Ubuntu package). But it is gray on 18.04 LTS. So I'll stay on 16.04 LTS for a while.