wrote:

What about the opposite conversion. Retro-fitting a Hassy 1600F with a P6
mount?

Since these cameras already are somewhat of collectable "classics", it
doesn't seem the right thing to do. Keep them "original", i'd say.

By the way, the 1600F's shutter isn't the most reliable one. That's why they
were discontinued after only four years. Four years during which we have
seen two (!) series of 1600 F cameras. These shutters will not have improved
much by aging half a century either.
Remember the Salyut/Kiev? That was a close copy of this particular camera,
including the less reliable shutter... ;-);-)

The "same mount" 1000F, on the other hand, is better. But that one too i
wouln't like to modify.
And not just because it would lessen its value as collectable, but not in
the least because you then wouldn't be able to use those truly excellent
Kodak and Zeiss lenses anymore.