Dr Noorman Van Der Dussen, Singelberg clinic. He does HA paste as well, quite a lot of genios, and occasionally le forts/BSSO. He does skype consults, I did one with him for revision rhino and he seems great, good aesthetic eye, and very experienced.
Dr Philipe Chout might have reasonable experience as he focuses quite heavily on beautification procedures
MM might but OK for just implants without any jaw surgery. His surgical plans suck but his actual technical surgical skills are probably fine
Sneddon apparently has a special interest in custom implants so might be a good option
Caroline Mills is a London based max fac, doesn't say on her site but possibly? She does zygomatic osteotomy, chin, cheek and orbital rim implants so I'm guessing she also has done some jaw implant work
Triaca
Zarrinbal
Swennen
All probably do it with varying degrees of experience