I found this online:
striped bass = striper Substitutes: grouper OR sea bass (less choice) OR tilefish OR halibut OR salmon OR blackfish
porgy Pronunciation: PORE-ghee Notes: This category includes the scup = fair maid, sea bream, red porgy, sheepshead porgy, shad porgy, whitebone porgy, and jolthead porgy. Porgies tend to be bony, but they're highly prized for their delicate flavor. Substitutes: ocean perch OR rockfish OR red snapper (not as sweet)
So, I don't know if the bream is a more delicately flavored fish and you might not be taking the most advantage of it's natural flavor? That would be my only question. Is it more of a technique to cooking the fish in the crust vs. a souped up flavor do you think? If so, it might be OK.
Hope this helps a little bit!