I’m not seeing any replies that are super helpful for your question - so here’s what I do: throw a Linux desktop on a Raspberry Pi, or NUC and use the TV like monitor. Get a wireless keyboard/mouse combo and watch Plex through the appimage or just Firefox. Bonus, now any website that does video can be viewed on your big screen tv without dealing with any casting apps.
tmux
and a<ctrl>-<b><d>
- done!