Have you tried using a retainer next to the canister ?Yes it is too small to stow the long hose so I just tuck mine into my harness. Still easily deployed but stowed away.
Apeks Hose Retainer
During my GUE Fundies both of my buddies didn’t have canister long enough.
One attached his daughter’s pink ruler (which snapped later) and another a toothbrush using bungees to make the canister longer
I have emailed Orcatorch and they said a D630 is coming in June and may be better for this. I couldn’t see the harness position in the video below.