I came up with something similar a few weeks ago before I just checked this thread. Except I don't use the A-stretch, but rather the
SRT/Newbie Routine stretch positions such as down, straight out, up, left, right and btc.
And what I do is 100-200 VERY QUICK YANKS in direction of stretch with hand below glans. Think of it like pulling the shoelace loops after you've tied your shoes, yank on the loops and it's the exact effect. It's an exercise that just happened when I was in resting state during a length routine, and since then I've been testing it in all directions.
This exercise is actually easier than any other stretching exercise. No pain, and best part is you can really hear and feel the ligs in action from the yanks.