Ozzie,
"One Hand UL" came up a few years ago. I can't find the thread.
But in terms of shelters a LineLock goes a long way towards one handed operation, both to tighten and to loosen. Putting a loop in the end of a line for the stake, and attaching the LineLock to the body of the shelter keeps the adjustment out of the mud, and allows for buried anchors in sand, and a "stacked rocks" approach.

I think anything with tensioned, arcing, poles would be a problem when you try to set the end in the grommet, and when you have to stretch the fly over a spreader pole.
Edit: My Terra Nova Photon might work if you added a "anchor tab" to kneel or stand on while inserting the pole into the 2nd grommet.
My Hexamid Plus would work.