Okay, figured it out on my own. Guess the problem was the game throwing a shit-fit.
Go to Body > Overall and open Material Editor (Body)
Under Shader, select
AIT Skin True
View attachment 950098
This will cause the weirdness I discovered earlier, but ignore that.
Depending on the card, you will want to go through all of the sliders
BELOW the XYZ/RGB settings pictured above and click
Reset on all the sliders
Do the same for the Material Editor (Face), except choose
AIT Skin True Face instead
Once you're done, the model's body will look like she's been splashed by a muddy puddle and/or that she's just murdered someone
View attachment 950099
Save the card immediately and
EXIT THE CREATOR
Once you reload, the skin textures will be back to normal-ish, but you'll probably need to make some adjustments in Material Editor to match the skin tone again, especially around the neck seam.
Hanmen's mod also messes with the
position and
colour of the eyebrows for some reason, so you will want to tweak those, too.
View attachment 950102
Got there in the end! Hope this helps!