Assuming you still have a working copy of 11 running on your machine you can always use EZSkin3 in that. Do your mat work and save the results as a mat preset. There is an option to save all zones on an object/figure as 1 preset. Once this is done your mats are usable in P12 and no more blue skin.

I never use the shaders or textures as they are with a character pack. I make my Photoshop edits and fine tune the shaders for each character. One click mat after that.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740