I had similar ideas in the past but never made anything. I wanted to have a host mode where it is hosted on a Chromecast. I believe Chromecast can run custom JS so it should be possible. Maybe even rendering on a phone and streaming to the Chromecast. That would make it even more low friction, so nobody needs to get a tablet or laptop out and hook it up to the screen. Would you be interested in adding that? If you'd want I can maybe even help out with implementing it. Maybe somebody mentioned this before but I couldn't find it.