q40s is a debian based distro. It comes with trinity desktop and has some very retro looking themes.

I tried it on an old laptop a while ago and it worked fine. But you could probably do the same thing with regular debian

Kde has its own thing now. Lots easier to find than its own spin

https://fedoraproject.org/kde/

I mean this seems reasonable especially with how quickly flatpaks are becoming so common.

I’m sure this wouldn’t happen for a very long time though