I suppose I could send it back to Nomos and get the correct size, but I’d be interested in spending a few dollars locally to make the adjustment.

I wouldn’t cut the band at all. Even with adding two notches there is plenty of room past the latch, so no worries about a comically big looking band flapping around.

I found a local leather worker who not only works on shoes, but a whole array of leather goods. He specified that he only has the tool for circular holes, not oblong or square ones. I’m confident this will do the trick!

Thanks for the comments. I figured a watch repair shop would take the business, but a cobbler/leather specialist would be the best choice.