I have a “smart TV” and I plug it into my receiver and use it as a monitor. I use the term smart TV that way, because it is more than 10 years old when TVs were just starting to have these features. I should also point out that the receiver does all of the spying that the TV isn’t doing. Not sure what I’ll do when the TV dies.
I once read an article that had ideas for 100 doors. They were clever. One would only open if you knocked on it. Unfortunately that’s the only one I remember, but maybe you could consider others.