@Leo83 - Mr. Axon in England does surgery for ES w/ C1 compression. Have you contacted him?
•Mr Axon, Addenbrooks Hospital, Cambridge (Otolaryngologist/ Skull base surgeon, very experienced with ES surgery, special interest in Pulsatile Tinnitus. Also does private work at Spire Lea hospital, Cambridge, for Spire Health care. Mr Patrick Axon - ENT Surgeon (Ear, Nose & Throat) | Ear, Nose & Throat Surgery | Spire Cambridge Lea Hospital
There’s been a number of discussions among our members who’ve seen Dr. Kamran Aghayev in Turkey. Here is a link to a post that should answer the questions you have about having surgery with him: