I think a simple mechanical device like a lever arm or cage that extends behind the towplane for a few inches may enhance safety significantly. Something that the tow rope would press against at a particular angle that would activate a lever arm that automatically opens the tow hook and releases the ring. How hard would that be to make? It would be independent of the tow pilot, where if the tow rope under tension pulled at greater than a particular angle to the towplane, it would move the lever back and open the tow hook, releasing the ring.

See what I wrote early in the thread and what response I got:

"We all know how the self-release works on the glider side at winch launching: at a certain angle the rope puts a pressure on a lever which causes the release. Isn't it technically simple to have a similar solution on the tow plane side, a lever above the rope, which pressed at kiting would release the rope immediately? Where am I wrong?"