Thanks everyone,
The clamp on brakes suggested by queerpunk and babypuke are clearly the best plan. Drilling a fork with such a tight clearance could cause weakness... and, as you said, it might not line up properly with a standard brake.
I had been considering two sets of everything (fork, bars etc.) so that I could easily "swap them out" and still try to race this bike at the local velodrome. But the clamp on brakes are a great solution and go along with the NJS thing...
I really like the NJS Keirin racing and am in love with this bike.
Thank you,
rj