Just buy an Apple TV or similar and never connect the display to the internet.
It has one job, display pixels, that's it, that's all I want it to do.
VLC runs on everything anyone in my house cares about, it's so simple no one has an issue with it.
You may be complicating things. I make do with a 1TB hard drive and SFTP over LAN.
Old tech works just as well.
Literally just download your torrents into a web root that is set to list indexes, copy the link into VLC and go :).
If that's all it does, it's a monitor, not a TV. A TV has a second job: to directly receive over-the-air (and/or cable) channels. That is, the presence of a tuner is what differentiates a TV from a mere monitor.