Oh, if only I was 12 years old again, I might have a fighting chance.
In fact I can disconnect and reattach the hose without too much difficulty although it's a bit more complicated due to the additional bulk of a Dive Alert attached to an Air Source regulator, and the way the corrugated hose is shaped it's sort of gotta be angled and slid into a groove, and when done at depth, under pressure, possibly with one hand while holding a spool in the other, well it's not very appealing to me. I once used my primary regulator to fill from the bottom- the SMB I used initially had a small bottom opening so I had to mess around with it and it kept flopping over so the air wouldn't go in and it would take too much time and effort. I switched to oral inflate and it's much easier for me.
I guess I'm not the only diver who isn't all that big on disconnecting and reconnecting the hose:
It's all sort of the same conversation and relevant to the Op who is looking for various SMB options one of which might be to carry an extra LP hose to inflate the SMB rather than fuss around with pulling off and reattaching the hose.