I'm in the same boat. Fact is that you cannot get an Italian ATP, just a CPL (no biggy, though).
It's a relatively simple process, but the waiting is veeeery long.
Here's what you need:
1. Send in to Civilavia a request to sit the exams for the CPL (there is a standard paper for that, but I guess you have to go to Rome in order to get it)
2. Have your medical done in Milan (Istituto Medico Legale)..you have to send it in with the paper above
3. Wait...and wait...and wait...
No need to go thu groundschool, but you'll have to fly a couple of hours with a CFI so you can get reccomended for the checkride.
Simple, isn' t it.
Point is, can Civilavia still issue you a national license?
I'm going for the JAA route which, in my case, is as easy as a national license.
PEACE