I've always thought when it comes to various ships like the TOS-1701, the Excelsior, and the Ent-D that they should have released versions with blank registry spaces, and include decal sheets with 2-3 different registry sets for ships of the same class that appeared throughout TOS-VOY. Just offer sound F/X or a sound clip from each episode the alternate ships were prominently featured in.
I'm glad to see they're rereleasing the Ent-A again, I still need to nab one. I'd like to see them also rerelease the HMS Bounty, FC Enterprise-E, and the ISS-1701.