I have serious problems with the idea of being "trapped" in a perfectly good airplane that's sitting on the ground. I would have personally volunteered to risk life and limb to hop down to the ground and go find a stepladder to borrow from maintenance.
Call it out of the box thinking, but is it really that far out of the box?
Maybe you have not been on a flight in a while or watched the news, but that plan would have been been more in the box rather than out of the box. The box I'm referring to is a cold jail cell. They might not have been able to get mobile stairs to the plane to relieve the suffering of the passengers, but I guarantee a nice federal agent with bracelets would have been waiting at the gate for you if you deployed the slide without the authorization of the flight crew and that authorization would not be given without an emergency.