Mirrors my plan. Almost.
Had the same dilemma after canceling the Monochrom order only to have it show up anyway. And then the dealer calling before I could cancel my preorder of the Typ 240. Sold the later and am considering another Monochrom body!
For color, I have been using the M7 with Provia, ektar and Portra. But the 5N has seen new life with this new adapter:
https://www.phigmenttech.ca/lmnex/
I have the hawks adapter and really love it's ability for close focus, but find its movement a bit undesirable. I always have to check and then move it back to position for infinite focus. The phigment adapter solves 2 problems, EXIF so I now what lens I was using and it remedies Sony's poorly implemented focus magnification.
As soon as you start to focus or refocus the magnification kicks in. I had pretty much stopped using the NEX until this adapter came out. It's pricey, but worth it as I have a viable and cheap option for digital with M lenses now. I have a few AF lenses for the NEX, but the AF is so slow, it's easier to use the MF lenses!