Don't know whether this is of any use to you but i flew with 3 other helicopters back in 2006 from germany to venice and on our way south we did cross the alps at Splügen Pass towards lake como (2x R44, 1x EC120, 1x AS350). We planned to refuel at Bergamo but were too late for AvGas (supplied from a local Aeroclub) so refuelled only Jet-A1 and went to Cremona (LILR) - a very small field from a local aeroclub nearby. VERY friendly and REALLY helpful .... maybe because it was the first (and last?) time they had 4 helicopters landing there at once. They even took photos for their local newspaper.
Edit:
Well, disregard the part about Cremona. Should have done some NAV research first
