IIRC, Campy cranks come with the bearings on the crank arms and the frame simply gets "cups" installed. Given that set up, you could always epoxy the cups into the frame and so long as you stick with the Campy crank, you'll never need to bother removing the cups. Loctite makes numerous products that should do the trick especially when aided by the existing threads. Not an ideal fix but it's far easier than reaming and retapping to Italian threads.