I may have a Sponsor at the start of the New Year who may offer these services, so if you aren't in a rush, that info will come out in due time. Until then,
reaching out to Dr. Shafer's office wouldn't hurt --
they offer a plethora of male cosmetic procedures, and while I haven't been told specifically that any sort of Botox is offered in the shaft or scrotum, it wouldn't surprise me in the least if they do (and I'll reach out to confirm this myself so that I can update their Listing on this site).
He's an excellent Plastic Surgeon and can also accommodate your filler needs as well if it is the NJ/NY area you prefer to stick to.