clean up the aluminum to a smooth polish, where the pry-claw left them,
and you May avoid it spreading a crack.

If there is a LH thread then you need a special Campag extractor,
but I thought that was just a particular Record, and was dropped after a few years.

I have several Campag cranks and none of them need a special extractor.

there is a Campag 8mm allen hex socket bolt for fitting on crankarms , too.