This is not Apple's support forum. It is a user-to-user support forum hosted (and governed) by Apple. Now consider that if an AASP doesn't have the knowledgeable staff how can you determine if anyone else has knowledgeable staff capable of performing what is a very delicate and complex task, when the slightest slip will ruin your device forever. There are no standards for independent technicians, no certifications or tests they must pass, and no state licensing processes, so it is truly caveat emptor. All you can go by is personal recommendations, and how do you know if those are legitimate, the moms of the technicians, friends, or paid shills? If Trip Advisor, Yelp and Amazon can't keep out paid shills how likely is it that anyone can?
If Apple allows discussion of 3rd party repairers that can create liability for Apple when someone gets burned by one. So Apple will not permit discussion of the subject or allow a specific recommendation of a technician. There are other places you can go for recommendations, but Apple Support Communities is not an appropriate place. But no matter where you go it is still caveat emptor.