hm, i sugested such a thing on impossible support.
it could be done, since they managed to make the Big Shot work with both 100 and PX film!
if i find some time, i might take up the challenge myself and figure out how it could work.
you need the roller-mechanism to develope the PX-film.
I've only ever known of pack film backs for Hasselblads. For all the new Impossible films you would need a back for Integral film like a Polaroid CB-70 like used on the Polaroid 600SE cameras. Maybe there was also an integral film back?