Ha! I know what you mean about the Renaissance Wax and elbow grease. Does seem to help to keep fingerprint damage to a minimum as it can be buffed off. I found on some glossy papers the RW will soak in a stain the print darker a bit.
I've used the Premier Art Print Shield in a mini-jet spray gun with good luck. They sell it in spray cans, and I suspect the Hahnemühle Protective Spray may be the same thing. I've also used the Marshall's SureGuard but it pretty expensive in the spray cans I bought locally ($22/can.), but it does come in Matte, Satin, and Gloss.
Now I've adopted putting the print through a printer that has the K7 inset and just using the Gloss Optimizer as a coating. I can dial up the thickness of the coating in QTR too with the "white-paper" profiles I load to do that. Much more even finish, no debris landing on it and sticking to it, and I've done it with canvas too. It will take the Renaissance Wax too, but takes elbow grease too.
SG