Sorry to hear about your bad luck.
MKS has a few nice models to choose from. Probably what's going to matter most to you is width and price.
You might also consider the options to fit to clips. Odds are a toe clip with the strap kept loose will give you some level of retention, yet allow enough movement.
BTW- you might want to ride with the pedal farther back under your foot than normal to lower the load on you Achilles, at least at the beginning.
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