- Buy the biggest LG C -series OLED TV you can afford and/or fit (WebOS, no Android TV crapola to deal with)
- Never connect it to the internet, LG wants to add all kinds of AI crap to it.
- Set it to Filmmaker Mode[0] to disable all of the "improvements" it tries to do to the image
- Buy an Apple TV
Done.
The ATV can turn the TV on and off and adjust the volume. You won't need the TV remote for anything after that.
I still use my 10 year old Apple TV 4k daily and it works like new, no slowdown, every single relevant streaming platform supports it with a dedicated app. It even got every single tvOS release until this fall.
[0] https://filmmakermode.com/ - also a good idea to do this to relative's TVs.