DG,
Congratulations on a successful mission! It sounds like what you need is a straight-back armless chair (dining room chair), pushed up against something solid. Maybe a couple of short step-stools would help, and wheel chocks for the wheelchair.
Safety first! While it may be a fantasy, you don't want to fall in Colt's lap. That would almost guarantee injury. (I imagine the conversation with the EMT's would raise their eyebrows!)
(http://www.arimecibo.com/noquiexis/Images/Last_words.jpg)
:-X :-\ :-X