In the absence of easily available conversion cassettes from Miche etc I think the way forward may be to respace a Shimano cassette to Campag spacings. The freehub is Shimano 11v so should be enough room for Campag 10v.
The problem will be finding a Shimano cassette where the lowest 2-3 sprockets aren't fixed together. You might have to build one using some replacement sprockets and a whole set of campag spacers:
In the absence of easily available conversion cassettes from Miche etc I think the way forward may be to respace a Shimano cassette to Campag spacings. The freehub is Shimano 11v so should be enough room for Campag 10v.