I’ve been doing some unhooked riding, and it works pretty well. I leash it just to the chicken loop d-ring, and leave the upper stopper pretty loose. When you release the kite to leash, the bar blows through the stopper, the kite fully depowers, and within a few seconds it flies off to one side and hits the water. No problems. You can even adjust the cam cleat while you’re unhooked - that’s handy sometimes. You’re probably safer leashing to a single front line, but I’ve had no problems at all with the chicken loop leash. Sometimes when I loose the bar I can haul it back on the leash before I even stop planing.
With the huge depower on these things though, you don’t really need to let go of the bar. I’ve been walking over reefs, lava rocks, walking out on breakwaters flying my One, and feeling very comfortable - when a gust comes, I just sheet out a bit further, no big deal. Easier on the feet too - no more getting dragged over the reef when I’m trying to make my way out at low tide.