I had a nearly broken ankle at one time. The rehab I was told to do was to get a rubbermaid, fill with sand, and write the alphabet deeply into the sand with my toes over and over. What a workout! Still, I have to wear real boots while others skip around in their slippers.
I have walking techniques to avoid sprains as well. My ankle goes so that the outside face is toward the ground, so on sketchy terrain etc, I consciously separate my feet by a wider distance laterally. Or, turn my feet outward extra, duck footed. Part of my problem is being very bowlegged, so I tend to get my feet crossing over my center of gravity on downhills if not careful.
The original Aircast is something I want to try out with little bitty shoes, my bro played soccer in one for a while.
Good luck with it!