I have to point out that the face is already in kotor 2.
Look at peragus logs, a guy in them had that face (The log you find in the T3 only section's console)
I do not know how hard would be to make an NPC's face become a PC face, altough looking at some mods, it seems that it is very possible to do.
You'd need an portrait for the UI, and that would be the biggest problem that i see (I'm not that familiar with modding, so i do not know if portraits are hard or not very hard to make.)
I even saw it on onderon's citizens sometimes.