You can just buy IPTV and and a Chromecast and disregard the headache of everything else. Megacubo for pCs. Plex was great but they have slowly just destroyed their brand loyalty.
IPTV sounds like a poor replacement for paying for access to content you don't control on someone else's Plex server, not a replacement for running your own Plex server with only content you want.
You run your own IPTV and then you use the available clients to stream your catalog. It works impressively well.