Italian ATC are easily confused
I have used G Callsigns, SX Callsigns, I-1234 Callsigns, I-A123 and to really confuse them I have used a Company designated callsign.
I abhor the 150m & 300m agl flight profiles that ULM are given to follow, I always adapt that by a 'self imposed' flight profile of 600m & 750m agl flight profile irrespective of ULM & GA.
In general I like Italian Aviation, just not sure it suits me with some of the craziness attached
The matter is the regulation, no input about foreign registration marks. And even the law about italian microlights in not...very clear!
Generally speaking, you are right thinking that using foreign callsigns, nobody will make questions...but just hope nothing happens...you would face italian unpredicable justice...
pasta & limoncello...don't match that much! limoncello if you like at the end prior to the coffee (espresso)...
in my place anyway no limoncello...we usually do pida e parsot...e sanzvès