Mail some to me.

A good, real parmigiano reggiano can be eaten by itself, in small chunks or slices...with bread or wine.
I'd shave it over a salad--maybe something simple, like greens/grape tomatoes/cucumbers/olives/balsamic vinegar.
Risotto comes to mind.
The rind can be frozen and later used to flavor soups or stews, but given your son's allergy, that's probably not as feasible for you (as I'd imagine he'd be more interested in eating a soup than eating a chunk of cheese with a glass of wine).