Considering Sliding Genioplasty to improve chin projection, advice? (photos)

24 yo/M. Upper and lower jaw don't align perfectly. But i am not considering major jaw surgery and braces. Only want to improve projection of the mandible. Will it also help in spontaneous lip seal as I can't keep my lips closed??? How good will be the bone union after healing and how much will it cost approximately??? I have added my current lateral profile and another picture of what I expect from the procedure

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