I was in an aircast boot for 18 months, due to Charcot Foot (Diabetic arthropathy)
I get tyeh HRMC but I did not apply for the care componenet as I felt I was not in need of it.
The aircast is designed to bear the weight, and I had no problem getting up and down the stairs when they fitted the boot, ethy should have shown you how to do that easily. Yes, at night I would take it off, and if I neede the loo, I went.
I could easily work with one crutch. but I did not have to keep teh aircast off the ground, as I have said its designed to take the pressure out of the damaged foot.