Over on the France forum, it appears the French Government starting August 2nd will provide European QR codes to select non-French people (
Expansion of the pass sanitaire - Page 14 - FlyerTalk Forums). I happen to live in California, and have a vaccination QR code from the state. It appears from that forum, that such a QR code would be accepted and turned into a European QR code. Would that European code then be accepted in Italy? I'm currently leaving for Italy, via CDG, on August 7th. So I'm hoping this is maybe a 'back door' method to get a QR code which I can use while in Italy.