Having never sent 120 film to a lab I have no idea what a lab print will look like. Is it square?
That being said, you can scan the negs and I think you'll be fine with the range of B&W films available in 120. Maybe use TriX pulled a stop for bright sunny days, processed normally for partly cloudy and pushed a stop or 2 on really cloudy days. Any lab can/will follow those instructions.
Have fun-That is the idea.-