Have you tried ALVR? It works pretty well for me at least. Supposedly the latest Steam Link VR beta works with several headsets too.

I block it’s MAC at the router to prevent internet access but I still allow it on the LAN for ALVR. The ALVR client can be side loaded so no need to let the Quest online.

Hopefully it’s not spoofing a different MAC to be sneaky though. I’ll have to check my router logs.