By the time you factor in the cost and added weight of something like this, you're going to be way better off buying a real view camera. And
the lenses will be more appropriate for movements too. Same reason the Hassie ArcBody belly-flopped. About the most practical or portable thing in an MF SLR with limited movements (front tilts) was the old Rollei SL66. Then various MF technical cameras have been made, some of which will accommodate your Mamiya back.