Genesis 3 Body UV Maps with Veins

HeroofTime123

So I'm trying to create a character with glowing veins using Damien Demon HD as a base. I tried making it myself by editing the base character's maps and adding veins to that, but I can't get them to look right. I wanted to add them to a bump/displacement map that could make them pop out and an emmisions map to make them glow. Is there any easier way of doing this rather than just adding them in by hand in an image editor?

Here's what I've done so far as well as the character without the edited textures for reference of what I'm trying to do.

FSMCDesigns

Joanan for G3 comes with Vein maps for LIE

https://www.daz3d.com/joanna-for-genesis-3-and-8-female