I have previously highlighted the Vladi Worm/Pink Condom Fly. I think it is the perfect creation for a heavily weighted point fly while dredging the bottom, ala Czech or Polish Nymphing. The traditional version of the San Juan Worm is unweighted, save the hook and the usual split shot is most often used to sink the fly. The addition of the beads is akin to any bead head fly..added weight, a little flash and more efficient at sinking and tumbling the fly.
So, if you just can’t find those pink condoms or some form of pink latex, then stay with the San Juan Worm and mix up the chenille colors. The link below is informative on how to tie a simple variation of the SJW. A little banjo music included.