Converting vanilla facepaint

[Neodarkside]

So I like some of the vanilla face paint, and since I use Extended Slider Colors and Racemenu, I love being able to make various tattoo overlays glow. For instance these tattoos in this shot.

 

 

Unfortunately the vanilla face paint doesn't seem to have the option to make them glow, and with the way it treats transparencies, cannot make a pure black color. Racemenu has a facial overlay menu but none of the downloaded war/face paint mods nor vanilla paint can be used there. Is there a way to convert them to overlays and let Racemenu use them in that option? I can get the non facepaint overlays to glow, like the picture, and can also make them pure black.