I want to replace both of the cartridge bearings
Good luck getting them out. Maddog34 is right that picks may be your only option. But you could bugger it up getting that bearing out.
I'm wondering if Campy designed it that way for a reason, they usually do. My guess is they didn't want it removed by the consumer. I'd call Campy and see what they say. Is the bearing making noise or not turning properly? If it isn't and you just want to replace/repack them 'just because', then, well, ok but then that that tells me that Campy probably designed these right if the bearings are still performing.
Maddog34 is right about Campy zigging when everyone else is zagging. They sometimes do goofy things with design. My Delta Brakes are a classic example of Maddog34 saying, "
and, there's a possibility that Campy Re-invented the wheel again... or hub, in this case... sigh."