Well, that's not good news. Feet are pretty unwilling to do anything in the way of bending or stretching as far as I know- having foot issues for many years now.
I ride Specialized carbon soled shoes- they have a wider toe box and narrow heel. I put in Superfeet instead of their insoles as well as added arch support and I've done pretty well this past 2 years with them. I wonder if that kind of shoe would help you. Mine have the cinch buckle which I like a lot.
I also use "look" alike pedals which spread out the vibration from the road- that also seems to help.
What kind of therapy are you looking for?
Hopefully you'll have this one worked out soon. hate to see you miss the Cindy ride!