I can ask about a system that can do this that’s not basically a PC.
I don’t trust integrated TVs. Fuck those things.
I guess a Roku (separate device from TV) isolated and only able to connect out to respective services could work.
You’d have to get network engineer creative in terms of what you’d want it to access on your network as well.
Might be a good exercise in terms of what’s out there in general.
I hate smart TVs…