Re:
Campag 8 speed is nominal 5mm pitch - exactly the same as shimano 7 speed. So you could lose a sprocket, pack the empty space with washers/spacers and get some 7 spd shimano shifters and mech and it will work.
Getting it to work with shimano 8 is not easy. You could get a shift mate or an expensive custom cassette, but its not a known easy match.