I've been doodling around with my own design for a few months now... I quite like the surface to be harder*, flatter, smoother so it has less friction and doesn't grip the glove/hand, as long as the flange is at the same angle as the edge of the hand... I can then push my hand against it without pinching or friction All selfishly optimised around my hand, my bars, my grips (sensus EMJ). It's a work in progress, but thought I'd share the variant currently on my bike if anyone else wants a try/meddle:
https://makerworld.com/models/3232426 *that in turn leads to...