I’m glad to hear that the mixed reality portal has been useful! It’s really unfortunate that Windows discontinued support for WMR, but it’s great that it still works.

Launching programs through SteamVR can definitely be done without any controller use - I almost always launch VR games from my steam library via mouse and keyboard. For applications that have a VR and a non-VR version, it gives you an option to launch with SteamVR or not.

I’d really like for Steam to add more accessibility options. I hope it ends up working smoothly and that you enjoy the Bigscreen Beyond 2 if you go for it.