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@Bearlegged
Conversion freehub?
Or you could look into Marchisio cassettes. They claim that "sprockets of any toothing can be assembled on any type of hub", and achieve this by using adaptors to ensure the sprockets fit the freehub grooves (Campag in your case), allied to appropriate spacers between the sprockets for whatever gearing system you use (Shimano). There's a fairly informative diagram here.