What the modelers who make the figures really ought to do is to make the palms and
soles a separate material zone.  In the DAZ figures, V3, M3, YT, David, Steph, etc.
the whole hand and foot is a separate material zone, as in the fingernails and toenails.
If they were thinking they also should have created a palms and soles material zone.
Anybody looked into the idea of using the grouping tool to create separate material
zones for the palms and soles? Then you wouldn't have to mess with the materials
for all of the different body parts to get them to match the hands and feet.
Like I noticed in your example you were showing the setting for the nipples.
This way you could save the character with the new palm and sole material
zones and then when you want to apply a skin texture, you just apply it to the
whole body at once with a mat pose, and then you only have to tweak the palm
and sole material setting.