I have not tried this but you got my wheels turning that's for sure.
Seems like it would work to me? I'd want to add some cranberry sauce in there with the stuffing! The stuffing would probably be completely soaked with grease and goodness but that may not be a bad thing. I'd use some nice thick cut bacon on exterior to help support the turkey sausage and provide some extra love.
Weber Performer, 18.5" WSM, UDS.