I have worn the vests with the "kick-stand" and did not like them. I would rather have a good vest and a good chair, rather than combine them.
I cannot always do it, but when I run & gun, I look for a tree with a stump or rock in front that I can rest my gun on. Helps my hide (and I can use a box call a bit easier), and not having to sit in that awkward position and rest my gun on my knee is a lot easier on my back; I can comfortably lean against the tree, and it is somehow less stressful. Just do not rest your hand on the rock/stump under the gun when you shoot, as that can be unpleasant.