This is awesome! I tried to do this a few months ago, by imoprting the G2F base as clothing item with sim, but it kept getting distorted during import, especially on custom models. This one actually looks good on the handful of custom models that I tested it on. Might go good with the hide skin plugin as well, but I have not tested that yet. Thank you for this!
I like ShakeIt's intertial movements better. Cloth physics 'jiggle' works ok when I can constrain it (like the lower leg where the shin bone is rigid), but on thighs and biceps it feels off to me.