I actually implemented exactly this a few days ago. It essentially procedurally generates channels from your library that you can flip through. Working on Chromecast support before I open source it
I'd be really, really interested in this, especially with Chromecast support. What are you writing it in? Perhaps I could help a little. Would appreciate if you could shoot me a message when you're ready!
As a plex plugin? Be very interested to have a play once you release, been hoping for something along those lines for a while :)
I'd love to hear when you open source this - it sounds perfect for me :D