That would be cool. I didn't dive too deep into it, but the server project for it seems like you can configure the menus any way you want since they're just HTML. You'd probably have to do server-side rendering or otherwise put all the HA API logic in the backend, but that could work!

I loooove that WeatherStar 4000 emulator and run a copy at home. It seems like it relies on Javascript so sadly may not play well with those old set top boxes. But if you get it working, please share.