No it is not possible to put a shimano anything on that hub especially a freewheel. You might be able to find information somewhere about respecting the Campagnolo cogs to work with 7peed shimano though.
https://www.sheldonbrown.com/k7.html
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk