Concealed engines represent the ability to angle engines above and below the flat ship. Putting the engines in front of the payload is our Goddard given right.
Forcing the meta rarely goes well. If inverted wedges weren't dominating MP something else would be. Metas pretty much always degenerate into monocultures unless there're some blatant roshambo interactions going on. Something that can't be done on a building block ship desighner like Cosmoteer.
It's better to have a meta that doesn't ban non-ugly ships for non-MP applications.