I have my NixOS set up the same way, with the CachyOS kernel and the CachyOS Proton for Steam.

on another machine I have regular Arch but also uses the CachyOS Kernel and I also use the CachyOS repos for that. Honestly it's CachyOS without all the extra bloat. And that's my own gripe about CachyOS itself. its' great, it just comes with a lot of crap attached to it making the install one of the longest out of any distro I've ever used. they really need to trim the fat on it.

What I would suggest to people is install Arch with the CachyOS Kernel and Repo. you'll essentially have CachyOS without all the crap.