There are lots of surgeons in doing the Chin Wing, in Europe at least. But they're not as famous as Triaca or Zarrinbal, so you probably never heard of them. I was at a consultation with Triaca and he spent like one third of the time bragging about this procedure and how he's always at conferences or workshops teaching other surgeons how to do the surgery. He even showed me an ad he placed in a French medical journal, for like 1000€ you could hire him to teach you how to perform a Chin Wing. He also told me there was at least one surgeon doing in South America, but he doesn't fill the gap with bone from the hip, which Triaca says is a bad idea. Anyway, the procedure is quite new, and it takes time for surgeons to get enough training and get comfortable with the whole thing, but it's slowly coming.