It is not that hard to do (when you don’t need the 4K-thingy and all the apps etc on the new OLED).
Just do as Johan wrote!
No need for a tv like the Sony with the speakers inside - they would have to be disabled anyway.
But be prepaired for some diy-ing in order to make the OLED-tv fit on the stand above the 7.2.
By the way, I have never heard of a 'motorized wall bracket for a BV4-50'.
P.S. If you really need someone to help, it would be helpfull to tell roughly where you are located.
MM
Location: Flensborg————Danmark