While that may be true, back in the day people used to use Ofmega/avocet and campy cranks and bottom brackets together all the time. It may work. Try it.

Obviously the danger is that the campy crank will go down a bit too far on the spindle, affecting your chain line and chainstay clearance. Worse case is that it will bottom out on the spindle before the crank bolt is tight. Easy enough to try.