*From the above description..

This (reduced) example of a 80192x4096 Alyson texture shown the idea.

Here I only use the U_Offset in the material room to choose the left or right area of the 8.192x4.096 map.

But in Photoshop or Gimp, I can rework the texture without fear of having colors differences.

For human figures, this seems like a good compromise.
And, yes, there is room to spare to put the eyes and inner mouth also. :-)

Best regards, Tony*

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!