I've started making changes in how I pedal. Trying to see if I can tolerate the foot position I would need to use to clip in again. It looks hopeful. I'm trying different techniques for taping my right ankle for extra support.
I've got a pair of double-sided Shimano SPD Click'r pedals, the easiest pedals on the planet for clipping in and out. I'll give them a shot first. I found a friend in Connecticut who worked through a similar problem, and she has offered a bunch of other modifications to try.
Lots of questions about what will help and what may work. The answer is really, really simple: I won't know until I try. (Fingers crossed.)