Another option might be to add a stiffer insole to your shoes. I had a foot problem, and the doc recommended an insole with more arch support. The insole was stiffer than a regular insole, and I found a side benefit of a firmer feel when riding. Sporting goods stores may carry some, I ordered mine, and in case you were wondering, these: https://www.powersteps.com/protech-control-full.html