For what it's worth, the mentioned Cowboy G Major too me six months to do, and nine to do it reliably. I started by using my right hand to get my left fingers in place, then let go with my right hand while pushing/pulling/flexing my left as hard as possible to keep the fingers from moving out of place. It was indeed truly impossible for six months, but every week I saw my hand being able to get a fraction of a mm closer to where it needed to be. Give it half a year, and a few hundred hours... That's unfortunately what it took for me.
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