I was lucky that my LG TV was root-able - so I could just run through the system and knock out anything I don't want. By default, updates and ads are also blocked via /etc/hosts which is neat.
The microphone also lives on the bluetooth remote - so I just paired a SofaBaton and shelved it ^^
But yeah... buying a PC monitor seems to be the best thing to do. Plop a streaming stick of your choice in if you want it, and that's the best you got. :/