Leica Screw Mount Lenses on Contax Bayonet Cameras

[brianmarshall169]

I'm sure this must have been discussed before, but I can't find it anywhere.

I recently acquired a Bessa R with some CV leica screw mount lenses.

I've also got a Nikon SP, Contax IIa and several Kievs.

I know Stephen Gandy sells an adapter to mount Contax lenses on Leica screw mount cameras, but what about the other way round?

Does anyone know if an adapter is available to mount Leica screw mount lenses on a Contax bayonet camera?

Or does the "geometry" of leica screw mounts and contax bayonets mean this is impossible?

Thanks for your help.