The surgery, Lefort 1 part of it is not aimed at moving the under eye area and the cheek bones. Google 'Lefort 1' for diagrams of the area it moves.
If you have aesthetic issues to an area INDEPENDENT of what the Lefort 1 aspect of the bimax surgery is aimed at addressing then you have 2 options:
Option #1, the SMART one:
Proceed with the surgery aimed at addressing what it addresses; the IMBALANCE of both jaws. Later down the line, look into procedures aimed at addressing other aesthetic issues you might have, eg recession to an area that the L1 does NOT correct.
Option #2, the STUPID one:
Be so concerned that the Lefort 1 will NOT bring forward the area you would like it to bring forward, don't get it for that reason and just live with what ever jaw imbalance you wanted corrected via the Lefort 1 that is part of the bimax.