I have done scripts that add a displacement map, add image maps and a blend node for tattoos, alter diffuse, transparency, etc etc settings in one or all, or a list of materials.  It isn't all that difficult , but coping with analysing the shader tree to see where it can best fit is harder. 

For a figure like v4 there are at least 3 maps (body, limbs,head) that cover all body parts , so plugging the same displacement map into all materials isn't whats needed.

It may be possible to write a script that can compare two materials and apply the different nodes and hook them up but honestly I just do it manually with seloect the nodes , copy paste and connect. I think scripts are only worthwhile if you are doing a lot of materials with the same changes.