Remember it's not just the raw number of vertices, but the actual IDs for each as well. Can that plugin properly assign vertex order as well? That would be pretty awesome if so, but I can't say I've ever heard of something like that. But then I've never had much to do with Max.
Leaving that aside, I still think getting them into the morph system may be problematic. We could attempt to replace the Qunari with the Half-Orc and the kid/child with either the Halfling or Gnome, but that would leave us one shy. Not to mention that neither the Qunari or kid are options in the vanilla in-game char creator - is it even possible to modify it to include them?