The key here: you need a shutter somewhere. The 203 Hasselblad and the Contax 645 are focal plane shutter designs -- the shutter is in the body. So you can use (shutterless) 200 lenses on Mamiya 645, Contax 645, and 200 series Hasselblad.
Contact Son Minh Pham for adapters for Contax. He makes them. There are others too.
The 500 series Hasselblad has no shutter in the body, so that means, with no shutter in the lenses too, then it's not possible.
Actually contact Son for anything you need that is off the wall, or esoteric. He has it all, if he doesn't he can find it, o rmake it and I just bought another 110 F2 from him because mine just packed up.
Son is great and works like camera stores use to in the fact you can talk to a real person, he stands by what he sells, he loves photography gear and he doesn't have any contractual agreements to keep him from telling the truth.
You don't see that anymore and if I didn't think the Camera world was such a mess, I would fund him to start his own store.
JR