Hmmm.  To do that, we could overlay the second skin material with a conditional (only appears where a discriminator map shows) ambient.  Else, we could use a low-poly envelope (conformed to the doll) so that the charge has depth.  The tricky part would be getting the animated charging effect to go where needed as determined by the doll (or envelope) template.

     This envelope is an EZ-Posed tube terminating in an upper-body figure, for Posette:

Poser 12, Poser 13, Poser 14, in feet.  

OSes:  Win7Prox64, Win7Ultx64, Win11

Silo Pro 2.5.6 64bit, Silo 2025.1, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5