How about a translucent powder? They do sell a LOT of powders for shine but don't know if a man would wear them? I remember seeing one advertised, just for that.. my daughter may know, I'll have to ask her cause her hubby shaves his head.
This sounds weird but...professional makeup artists use this powder that is made for clowns. It comes in a canister that looks like the ones for baby powder. You just dab it on and it mattifies the head...even if you are sweating.