Hello Ilario, thanks for the good news; as a Wikipedian, however, I am bound to ask some questions :-)
1/ Do you know what's the licence used by the region for the lists? Are they going to be released under a CC-BY-SA compatible license (or maybe CC-BY-SA itself)? 2/ We actually had a similar problem in Poland last year (no true unique identifiers) and - as far as I am concerned - Wikimedia Polska will be working together with a Warsaw-based think-tank and the National Heritage Board of Poland - that's the organisation responsible for maintaining the lists of monuments on a government level - on creating the first-ever system of totally unique identifiers. Do you plan to contact the institution responsible for the lists in Italy and work with them on your local system? I think it'd be nice to have such a cooperation, for various reasons...
Thanks,