I use pithouse, most games work.

No workaround for the cheap amazon handbrake works but that is more the cheap handbrakes fault, works on windows

Iracing and WRC don't work, neither does f1 and a few others.

I play the crew motorfest, dirt rally 2, asseto corsa (mods are less finnicky on windows, im swapping), beamng (beammp works on windows, swapping their too), most free and cheap on sale or key games worked otherwise. It was mainly an anticheat issue, the wheel and settings function better with the third party linux app for me for moza.

I dualboot and swap to windows when I want to play iracing or wrc, it takes a minute maybe, on a second drive to avoid issues. 90% of the time I just play somthing linux compatible which includes most sim racing games.