Having a beard and sideburn assortment also is a great idea Joe! Those are some of the hardest things to get your hands on, really.
Another great thing to have as an add-on assortment would be other pieces that come as part of a klicky and don't have part numbers... stethoscopes, microphone headpieces, big earrings, gun holsters, vests, long jackets.... there's really only a handful, they could be offered in an assortment, IMO.