Fortunately, this fucking windows partition I only keep for VR with my shitty Oculus Rift CV1 reminds me how fucked up the alternative is. I can't fucking wait to get a Steam Frame and ditch it.
Did this yesterday, checked the CachyOS wiki beforehand, ran the command it says to remove the Nvidia stuff, command apparently does nothing. Shut down, swap cards out. Started up, Cachy had a fit and wouldn't boot. Dropped into tty, manually removed all Nvidia packages, reinstalled AMD equivalents, rebooted and then it worked.