libratbag and Piper don’t support my mouse (or any razer mice), unfortunately. I’ve also tried input remapper… couldn’t get it working right on Bazzite, but maybe I was just doing something very wrong. Will give it another try!

I have. That allows for control of lighting, but doesn’t do key mapping/profiles.

The only thing stopping me is I can’t figure out how to remap the side buttons on my razer MMO mouse in Linux.