The cartoony parts are a real sticking point when it comes to the humans. That could be a future possibility, though I do have quite a few modded heads already on my list before I'll need to start scrapping the bottom of the TOR barrel for resources.
But using TOR aliens might definitely be a good alternative!
Curious, fortunately KotorBlender didn't have any issues with it. I have edited the models and uploaded them as a proposed addition to K1CP. For now, you should be able to download them directly from the K1CP issue page: https://github.com/KOTORCommunityPatches/K1_Community_Patch/issues/755