I wouldn't be so quick to abandon this thread yet.  I tried your PZ2 and have come across some problems with it's implementation.  With the 2nd layer vascular map loaded on the figure, you cannot apply a Mat Collection without losing the vascular map.  It remains if you apply the skin textures from a MATPose, so this implies that you cannot load textures using both MC6 and PZ2.  Also, the glossy skin remains a problem when loading the no-glow MATPose and it still attaches the Bump Node to the Gradient_Bump.  The glossy skin is not influenced by the base layer, it needs to be controlled by the second layer.  If you examine my Material Room screencap, I included an Invert Node to control the roughness and an HSV node to control the veinous intensity.   With the HSV node in place, there is no need to offer several maps of different intensities.