Make your doctor give you those insoles, then, or ask him/her to approve/recommend a stiff-soled shoe. Actually, you might even be able to walk in cycling shoes that haven't had the cleats put it--come to think of it. Believe me, you can heal it without the boot. But one thing I didn't do during the healing period was push off the wall. For it to heal you really do have to not flex it. No pushing off with that foot...
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks