Somewhat off topic, but as I have owned both the P and 7S and Leica IIIG, and used M 2 and 4s, but not a Nikon, I would consider a
7S or 7Z with working light meter. I liked the feel of the IIIG better than the 7S, but the 7S was for me just more functional, think M4 with screw mount lens. I had the standard Canon SM lens the 28mm, 35, 100 and 135 with a few other odd lens such as a Minlota 85mm. Perhaps not up to Leica standards, but good performers as well, and any Leica SM lens will work on a 7S.