Am I suitable candidate for a sliding genioplasty? (photos)

Insurance should cover the majority, if not all of jaw surgery. You have several issues that would qualify you to be covered because it is medically necessary. Jaw surgery would not only improve your overall quality of life, but would address your aesthetic concerns as well. A genioplasty however would be strictly out-of-pocket because its a cosmetic procedure. Yes, it may help to improve your profile by giving your a stronger chin and more definition, but it would not improve your bite or bruxism. There is a slight chance it may improve sleep, as it can help with opening your airway (helps with sleep apnea). Overall, you would benefit most from jaw surgery, but aesthetically, a genioplasty could improve your profile

Jaw surgery may be ideal but without a significant malocclusion it would be hard to get it approved. A good alternative is a sliding genioplasty which will provide significant aesthetic benefit and the forward chin movement would be in the 12 to 14mm range. Anything less would be underwhelming.

Yes, a genioplasty does improve the facial profile and some amount of the lip 'incompetence'. Your growth pattern 'did' ideally require 'jaw' surgery and the dental extractions were less than ideal for long term soft tissue/lip support. However, esthetically, a chin surgery is beneficial