If I was you, I'd check thoroughly inside-out possible solution with many maxfacs and plastic surgeons. If they were unable to show me an accurate simulation model of post-surgery results, I'd run out of office. Even with simulation it's hard to predict final outcome due to soft tissue uncertainty, let alone judging end result by few before-after pics shown by maxfac, possibly on opposite sex.
I think it comes down to what you want to pay for.
Rational expectations
Doing those simulations (doing them carefully) takes a lot of time from the surgeon.
Or you have a surgeon who hires a "service" to do that work - - - in which case you don't really get the expertise you were originally hoping for.
So if a surgeon in Santa Barbara does a double jaw surgery for $50K and it takes 4 or 5 hours - - that is ~ $10K / hour. (yes, that has to cover the patient consult and work up time - - so figure half that . Still a big $/hour number. )
Do you want to pay that surgeon to spend an hour or ? (even with great software) to personally do that "morph" ? When ultimately the morph is just educated artwork ?
If the patients are not willing to pay the surgeon to stop seeing patients in order to take the time to do that work - - how does one rationally expect to get that done ?
Better - - in my view - - is:
To find the right surgeon. One that does digital skeletal modeling (routinely as part of the pre-surgery work up) from the CT scans and to thereby very accurately define the intended new surgical location for the jaws and get the SOTA 3-D printed splints so that the results are as predictable as possible.
It helps if the orthognathic surgeon is also a good plastic surgeon and they can address any other cosmetic issues at the same time. Those plastic surgeons will have a full bag of surgical tools to address any of the other aesthetic issues, which the dental/oral max/fac will not normally have.