Gonna be playing some RoR2 VR later.
A friend of ours made this guide:

quick steps on how to get the RoR2 VR mod working for later:
1. install r2modman ( https://thunderstore.io/package/ebkr/r2modman/ )
2. open and select Risk of Rain 2 as the game you want to mod
3. on the profile screen, select "Import / Update"
4. import new profile > import code > paste "qKx89V4yhw" in and create the profile
5. go to the Installed tab under Mods and ensure all mods are downloaded properly
6. right click Risk of Rain 2 in your steam library and uncheck "Use Desktop Game Theatre while SteamVR is active"
7. go back to r2modman, put on your headset, and hit "Start Modded"

Hope it's useful for others who would want to play it too

https://www.youtube.com/watch?v=gFNzWI2sFKM