Good design is as little design as possible.

I bought a Bravia, it doesn't connect to the Internet and it doesn't have a camera or microphone aimed at me, it performs quite well at being a television.

A monitor maybe? Not that they make that big ones... maybe buy a big panel, build a frame or mount it inside the wall.

Yes, but you have to shell out more money. Look up "digital signage" displays.

You can just not tell it your wifi password.

I did that and manually set my IP address to 1.1.1.1 with a 255.255.255.255 subnet mask. I figure that's one more level of protection so if my wireless radio can be turned it, it won't be able to connect to a network that's baked into the firmware or something. (E.g. if Samsung has a test net that their TVs automatically connect to if in range.)