I think you have to re-evaluate your financial comparison of chin wing vs. bimax. Although you can say it's 'cheaper' to get LESS than ONE HALF of something than to have the WHOLE of the other, that's not a good financial comparison because with the bimax you are getting BOTH JAWS and also the ortho that allows for the bite/smile improvement. So, the financial comparison would be something like this:
Chin wing: $10K for SOME of the lower jaw to be moved forward (the lower BORDER of the mandible). So 10K for PART of one thing
vs
Bimax BOTH JAWS plus bite and smile correction. Break down to $10K for upper jaw, $10K for lower jaw 5K for ortho work=25K. So, 25 K for 3 things that make up the WHOLE of correction.
So, with the bimax, you are getting 3 things that make up the whole of it. With chin wing you are getting just one thing whereas to the lower jaw area for 10K, it's only moving part of the mandible (it's lower border). So, FINANCIALLY speaking, the bimax is a better value.
Your financial comparison is kind of like saying: 'I have 2 cavities that need to be filled. But it's cheaper to get just one filled.' Well, ya (and duh), it's more expensive to get ALL of the whole thing that needs to be done. But that can't be assessed as a legitimate 'downside'.
Having to 'wait for rhino' can't be considered a legitimate 'downside' either simply because the wait period for rhino with the bimax has a CHANCE of your nose looking better (or less bad) on the face when both jaws and the smile are addressed with the bimax. Although you might still need (or want) a rhino, the type could differ simply because the nose's relationship to the face would differ after the bimax. So, the 'wait time' is actually a RE-EVALUATION of the nose.
Just from what you say, you really WANT the bimax and what you assess as a 'downside' is NOT a legitimate downside at all.