Good idea, but it will take some fine tuning, as I can't see the corners of the screen when stopped down. I guess it would be worth a roll of film in order to "program" the lens hood.
I'm a little surprised that these RFHs suffer this problem. Mine are circa 1970 (I guess) so ultra wides may have been rare when they were made. Surely the latest ones must be better - especially for the money they are asking.