Hello, I am so sorry you are having this discomfort. Since this issue has been going on for so long, I would see a podiatrist, he/she will probably be able to help you with someone who can "customize" the shoe or insole to make them more tolerable.
I feel sorry for the situation you are on!
If the changes in the skin cause more discomfort, the doctor will cut out the thickened tissue after injecting the anesthetic drug.
When considering what works for corns on the feet, alternative treatments come to mind, such as:
rubbing castor oil in the place of calluses - causes their gradual softening,
placing a fresh lemon peel or a strip of fresh pineapple on the imprint,
placing a wet tea bag on the im-print every day,
applying kvass compresses at night,
soaking feet in a decoction of oatmeal,
apply gauze moistened with water to the corns and wrapping the feet in plastic foil for 15 minutes.