I'd be curious why you think you even need jaw surgery. Your face and jaw proportions looks fine to me in the scan, and you say your bite is good.
I think your concerns about the nose are legit based on the soft tissue position in that scan.
I don't think this is a CCW case. In fact, your face appears short to me. If you think it's already long, I think there's a perception issue here, or you need to share photos of yourself in the flesh so we can see this length. My first instinct wit this case was to consider extracting two lower premolars, and then having the lower jaw advanced. But that would elongate the face a bit, and your perception that you're already long gets in the way there. Maybe you are, but I don't see it in that scan. Feel free to email me photos.