I haven't done this particular bone surgery, but I had my jaws broken and moved forward (sleep apnea) - not painful at all if you have a good surgeon. And in this case, they're moving it bit-by-bit over a long period of time.

I imagine some physical therapy and you're all good - the nerves can stretch just fine.

Plus, if you know the risks, and you want to be taller - go for it. One life, spend it how you wish.