Vorpx will work with any treadmill
You need to have vr controllers active in vorpx, run through steamvr API.
And that’s it.
The treadmill will overide the controller that is emulating Xbox controller/mouse & Keyboard
The only use case I know of that didn’t work is walkovr.
Personally I have tried Kat loco and natural locomotion and walkovr and they all worked as expected (apart from walkovr)
I could even achieve decoupled walk/aim