"I'm looking for an OB/Gyn who will do this" - Keep looking and you will find one. But - why stop there, why not let your Ob-Gyn perform your heart surgery or back surgery as well - surely all surgeons are inter-changeable?
In a nod to 1700 era medicine, BY LAW, anyone with a medical degree can PRACTICE any branch of Medicine he/she wishes to DESPITE any formal training or certification they really had.
Great for plaintiff lawyers and sellers of medical equipment - really bad for the average, uneducated deal-shopping American patient.
The VAST MAJORITY of Plastic surgeons completed training in 5 years or more of General Surgery and then trained in Plastic Surgery, making Plastic Surgery training among the LONGEST in American surgical training. Yet despite our training - very few if any of us practice general surgery. What makes you think that a GYN (4 years of TOTAL training), or a Family Practice doctor (3 years of training) are as qualified to do your tummy tuck as a REAL Plastic surgeon?
I truly wish you luck in your search . You will REALLY need it.