Well, guess I’ll just answer to myself so that maybe it can be of use to someone other than me.
I found a workaround by not using VorpX and sideloading a free app on my Quest 2: Moonlight. Along with Sunshine on host PC, it allows local gamestreaming and supports controllers directly connected to the Quest 2 via bluetooth.
Unfortunately, it doesn’t support any kind of 3D streaming natively. There may be a way do that by adding another app on top of Sunshine. Seeing as I can’t find any information on how controller support works in VorpX and how to configure it, I’m going to head in that direction.
That’s a shame, I never got the Quest 2 controllers to work as a gamepad in any game I tried with VorpX. Should I just stop trying or is there something wrong on my end?