Hmm...
I don't see animal heads/etc being a problem in the way of size, just look at the Southridge Zoo. There are animal-shaped NPC's in there, you can even buy the heads. One of the main rules is "No tiny heads/bodies" so I don't think that's the problem.
To me, dragons basically count as animals and wouldn't seem that strange in era, since cats are allowed. Also along the lines of animal customs, there are animal/non-human heads in the buyable head packs anyways.