Managed to get 2 USB cameras working through a Raspberry Pi 4 with Dicaffeine installed as an NDI streamer. Got 2 more working directly through my laptop for a total of 4 plus all the other random stream crap I have shoved into OBS.
Also repurposed an old Android phone as a wireless mic pack streaming a lapel mic to my laptop.
Itβs like a Rube Goldberg machine of complete nonsense