Well, if we're spending other people's money, have a hydrolic arm mechanism which folds into the alcove with the TV on it. Samsung Frame means you can pretend it's a picture. Then when you want to watch TV, pull it out from the alcove and over the chimney breast. Then hide away again when not in use.
Make sure it can raise and lower too, so as a picture, it's higher, as a TV, lower.
Job done!
Just the cables to worry about! ?