Harvest current bra sign makers->Invite them to this experiment->ToS-less Sign Sub-forum created under Gaia->simple bot that searches out keywords such as bra sign/cleavage sign/etc->PM users looking for said signs.->They register/set their orders here->If the bra sign maker requested is on a "set and forget" plan (have them pay a fee to our own pot per transaction for this plan), shoot them a message on Gaia with the buyer's request.->Rinse and repeat.

Sounds like a do-able experimental "feature"