Haven't tried that with mine. I'm sure you could make it work with some creativity but those exo's compress down pretty well. Check out there YouTube they have a few videos on how to compress down their bags for day trips.
Interesting idea, but I don't understand the waist belt on such a small bag. Would be easy enough to make a couple of shoulder straps - I'd think 6ft of webbing and a couple of buckles would get it done... Interesting idea - I'd love to see some photos of what you come up with!