Thank you, actually having a log to go through was very useful! Kinda. I managed to suss out that vkBasalt was having a config issue, which I eventually fixed. Now all my OS drive games seem to launch fine, except SteamVR (still).
I was able to do a little more research with info from the log and I found out running SteamVR the usual way was broken. Launching Steam from /usr/lib/steam/
makes it...sorta work.
Yeah, turns out it happened to be a separate issue from my initial problem, but with the same symptoms.