You need a focal plane shutter and a way to set the aperture in the lens.
Without that there's only real ugly hacks, like setting the aperture on the canon to what you like with the lens on, hold the dof preview button (so the aperture is set on the lens), and while holding it remove the battery from the camera. The lens is now set at your desired aperture.
The next problem is that you don't have a shutter. Then you can do it in the 1800's way, it have really really slow film an expose by removing the lens cap, and end it by putting it back on. This you can simulate with a strong ND filter (10 stop?). Then shoot with the Hasselblad back in pinhole mode. With this procedure you should be able to make an image with the lens without shutter or aprture control but as you see it's not very practical.