You are cutting it close (pardon the pun)! I hope you realize that just because you get out of the cast, you will have to rehab the ankle. I don't know what job you will be doing in Alaska, but you might want to consider this. Does the surgeon know your plans?
As far as using cadaver bone, the testing is very comprehensive on this. Your own bone is better because it has all your stuff in it and you are not starting from a skeletal matrix. Unfortunately, it requires a 2nd site surgery.
If and when an insurance company covers a bone stimulator, they usually require non healing for 90 days prior. These are expensive items and the insurance companies are not wild about paying for them. If you can get one, by all means do so. It will probably help with the healing.