That only took me, what, twelve days?
Did something different this time: pulled the elastic drawstring tighter at the inner side of the foot only, and stitched through in two places to anchor it, then loosened the elastic at the front of the foot. If this works like I think it will, the shoes will hug the inner foot while not putting extra pressure on the tendons on top of the foot. So there.
Taped down the ends of the drawstring using that medical tape stuff, the kind that looks like grosgrain.
Didn’t end up whipping down the sole because Twelve Days, People!
But now it’s done, yay!