The simple answer is: any

Smart TVs are just a normie alternative for what tech enthusiasts were doing for 30ish years: put a computer next to the tv and use it.

Alternative, get yourself something capable of running Moonlight (https://moonlight-stream.org/) and run Sunshine (https://app.lizardbyte.dev/Sunshine/) on your workstation, I am even playing games this way. RPI 5 works great, also libreelec (https://libreelec.tv/) is excellent and has Moonshine plugin.

You buy a TV, NEVER connect it to the internet and set up small computer next to it. Obviously not Android based as it is spyware on its own.

Then use it. It is that simple. No special methods, software, whatever needed, tv becomes only a large monitor for your computer conveniently placed in living room.