Bill/SFNM's word is gospel on the subject for me. Good thing that I independently happen to agree on this one

The heat of the pizza fresh from the oven will warm the prosciutto more than sufficiently. (Unless you want baked prosciutto...which will dry out, become chewy...) Good luck!
Gypsy Boy
"I am not a glutton--I am an explorer of food." (Erma Bombeck)