Could you carry one of those around with you, like in a customized external frame backpack? I got one of those at a yardsale and considered creating a bike carrier out of it. Would something like that work, perhaps with a carrier designed to transfer as much weight as possible over the legs? Because, otherwise, turning would be difficult due to the centrifugal force leading to unsteadiness. Not to mention the possibility of flipping back over unless one maintained a constant forward-leaning posture. Of course, that assumes that one would carry it perpendicularly to the back. What about parallel? Yes, some of the same constraints would apply, but they would not present as many difficulties in that regard. However, the difficulty would then arise when attempting to go through doors, with tragedy a distinct possibility unless one were constantly aware and made sure to go through doorways sideways.

UPDATE: A solution has been found. That's also very Susan Boyle-ish.