I'd try for a recessed lensboard solution first. I have a Zone VI Ritter camera, which is similar to the Wisner you have. I modified the front standard to allow the mounting of Technika recessed boards, which gives me acceptable movements for my 90mm f/8 SA.
Of course, the bag bellows would be the real solution for shots with a larger-IC lens on a flat board, but for field work and not having to fiddle with bellows changing, a recessed board and an f/8 lens may well be the best compromise.
Best,
Doremus