Alright. I do understand your situation.
It is weird that a specialist (no matter how good he/she is) tells you that he/she will not go near that ankle the way it is. You must understand that most old specialists are experienced with old treatments but are not that familiar with the new "times", there for they will not "play" with new treatments if they can avoid it.
I do belive (by what you told me) that he performed a stressing test on the affected area. That is all good, by what you explained me, looks like you don't have any issues with your ligaments. That said, the fact that the area does get sore is a red flag that should be clear.
When you exposed the debridement, I was afraid on the arthritis factor, but I did not want to add to the already depressing moments.
If you were feeling confident with your doctors diagnosis (and let's face it) you wouldn't be here, so follow your feelings and do get a second opinion. I will tell you what I keep explaining others: Many times, X-rays do not see nor unfold the issue, and you would need a Magnetic Resonance Imaging (MRI).
As I told you on my first reply, "destroyed" cartilage is the start of many other issues, if not caught on time. I am sure, that by now, you know what and how a cartilage works and do.
Under proper hands, you could get some cartilage "fixes" (if conditions are adequate), just like the example you gave us (ACI).
I am sure everything will go well. On the mean time, If I were you I would try to immobilize the affected area (as much I could and till I get a second opinion), even when sleeping. You could get a walker (air cast boot). Try to not overuse the area, since you expressed concern about it when used for long periods.
Relax and don't stress out, everything will be fine you just need to have patience.
I can only tell you what I would do if I were in your shoes.
Good luck.