What are some brake options for a 36" Nimbus Nightfox

General
1

Looking for brake options. Wondering if KH Spirit cranks fit the Nimbus Nightfox? Could I mount V-Brakes without drilling a hole in the frame? Any relatively inexpensive recommendations for a braking system?

Note: My uni doesn’t have the right hub and mount for disc brakes.

2

As long as the hub has an ISIS interface I see no reason why they wouldn‘t fit.
That said, I have concerns that a 125mm hub plus cranks with a Q factor could be a bit too wide. So, while it‘s feasible, personally, I wouldn‘t do it.