We have an older curved 55" Samsung “smart” TV that I put in the basement for the kids. Mounted high up on the wall, out of reach of little destructive fingers.

Turns out it can be configured with a default input. When I moved it to kid duty, I cleared out all the wifi credentials (I think I just factory reset it), disabled all the “smart” garbage I could find, then stuck a Roku stick in it and set that input as default. The Roku remote handles TV power and volume, and the Samsung remote is put away with the rest of my tech hoard stuff. Pi-hole on my network removes the Roku’s ability to show ads at all. I always forget that there’s a big ad spot on the home page.