I'd kind of not want to play without straps, even if they were really loose, that is better than nothing. A little mistake and suddenly you have an accordion on the ground or at the very least it's constantly moving as you push and pull, and you kind of end up fighting that. Maybe it would work better with smaller accordions, I've not played anything smaller than a 41/120 in my life (except my first Titano as a REALLY young kid... lol).
I've just come back from almost 2 hours of snow shovelling, and everything on me hurts, including my lower back. I'll admit that I am blessed in that an hour or so from now, I can go downstairs and practice without pain (sitting only, of course).