No, to make a shimano work, it would take much more than filing.

First, you need a new hub. Shimano cassettes aren't compatible with campy hubs. As well the cogs are the wrong spacing for campy derailleurs so you would need to change them which involves messing around with pop rivets etc.

It is possible to work in a shimano hub, but it will be so much work, you may as well change the whole drivetrain.

I would do my best to try to find a campy cassette.

I wish you good luck in finding it.