Hey there Jeff,
What you describe sounds similar to a program the Canadian military has for officers. They can join the forces and serve as an officer as long as they make significant progress towards getting a degree. I've never met one who actually did any kind of academic work though...lol
As such, they are limited in career advancement and pay initially but enjoy full benefits. I hope you're right about getting full benefits before you ever become a permanent employee.
There ought to be medical supply stores near you where you can pick up the right sort of crutches or what-have-you. I got my cane from a local store, right off the shelf. You will want to make sure that you have the crutches adjusted properly for you though. I know with canes, it is important to adjust them carefully to avoid causing more problems and I suspect the same is true for crutches as well.
Good luck to you Jeff,
Chris