Hi folks, I just watched the RL tutorial on using the Fur popcorn effect and they used curveguy to add a beard and mohawk using the texture for emission channel on top of the curveguy UV map.  However, curveguy is unique in that he has a single UV map for his body.  How can I get this effect specifying certain parts of the body for characters with multiple UV maps for different parts of the body?

Tutorial is here at around the 16:30 mark - https://www.youtube.com/watch?list=PLNV5zSFadPdnnsQgETl2SSUcsX_OfdDk8&time_continue=996&v=_n7HjUUiQzg