I wonder if Heresphere could connect to a Keon when running through Proton. There is a free demo. This wouldn’t require Intiface.
https://store.steampowered.com/app/1234730/HereSphere_VR_Video_Player/
Another angle:
User penti claims that some apps running through wine can connect to the linux Intiface.
https://discuss.eroscripts.com/t/has-anyone-got-initface-desktop-working-with-wine-linux/66723/6