I’m trying to do this now, but dumb high-quality appliances are hard to come by and much more expensive. I don’t think there’s any dumb TVs at the state of the art.

Dumb TVs are sold as digital signage. They are the state of the art for durability/reliability but they typically have a screen from the "previous" generation, so for example they might not have HDR.

It seems that less and less such devices are being produced.