I once adapted a Petvzal to my Hasselblad using one of the lens adapters that Hasselblad once made. The lens has its own focusing gear, so just needed something to mate it to the body. The 6x6 format basically only covered the lenses sharp center area with no swirly bokeh, so didn’t really accomplish much towards unique images, so I undid it all.
I relied on the blinds in the camera to serve as a shutter, which works, but doesn’t work very well if you need short exposure times.