I am repeatedly asked for referrals to physicians who perform "pro bono" procedures. I am unaware of any who voluntarily do this. As I have stated to others asking the same question, even if a surgeon were willing to perform these procedures at no cost, there are still substantial fees for operating room, anesthesia and hospitalization costs that would be needed. The suggestion of seeking a university teaching hospital with a plastic program would likely be you best alternative.
Try writing or going to Universities with medical programs for PS, that may be able to help you.