I wish for a SL-2 Monochrome (or S1R Monochrome). But only if no-one gifts me an IQ-4 Apochromatic with an XT and 50mm HR Digaron-W.
On a more serious note, the M10M looks like a great camera for dedicated B/W shooting, especially if you print large and wish for the best possible pixel level detail and contrast, and have a somewhat traditional way of seeing and working with tone. A M11M would turn heads even more, with the right lenses. A SL-2M with Karbe’s SL APO Summicrons would be a masterful B/W tool.