It looks like your lower jaw can be moved pretty substantially, linearly, due to a large dental overjet. You might be able to get away with a few mm there, and then another few mm rotating the chin with a genio.
Is that your wisdom teeth? Do they plan to remove them first?
Kaiser has a bad reputation, so maybe get another opinion. Who is doing the surgery there? Upper jaw widening is a three piece, and it's not the easiest surgery. Regarding rotation, I don't think your angle looks super steep. Maybe borderline CCW case. That's why I'd ask around, in addition to the risk of segmenting the upper by a Kaiser doctor.