Problem is that refs miss it. I still say you can put an official in the booth that can't throw flags, but can eject players when they see blatant penalties like blows to the head and the knees. The reason he needs to be in the booth is he needs to be able to look at replays constantly because he's not needed on the play to play aspect of the game.
Fournette wouldn't be a back up for long. Stew would get dinged up per usual.
Hell, it wouldn't shock me if Dave made Stew cap casualty if he drafted Fournette. Especially if we needed to free up some cash to get some guys like Norwell or Turner or maybe even Short signed long-term.