Is it really that hard to open the door though? The door on our C152 is always popping open and I've never found it to be that hard to swing open and shut it properly again. Our ex boss used to open the doors on the C172 as a demo to get it to yaw without touching the rudders. Might be a bit harder plummeting earthward at 180kts mind.
I would say that certainly on the high wing 152 you could pop the door, grab the strut and bail out without too much bother if the IAS wasn't ridiculous.
Guys and gals on the ground are going to be enjoying a big lump of metal either way in any scenario were you had lost control, only difference is it will be 12 stone lighter as I'll be floating down rather than sat in it swearing
Good point about the space though, have worn chutes in a 152 during spin training and cosy doesn't even begin to describe it!