Not that I've seen one in real life, but have you considered the Nikonos Calypso or the Nikonos III? They were available with a long 80mm lens, have an uncoupled? range finder, shutter speeds up to 1/500th, are/look sturdy enough to to handle some vibration and have a wire frame winder on top. It's maybe an odd suggestion, but why not? They come cheap these days on the second hand market places.

(And, please do correct me if this is nonsensical advice)