I know what you mean, I've gotten to the point now I'm pretty much happy with Autofit clothes wise, not perfect, but good enough for what I do. As for hair, I never Autofit hair, just add to the scene, (cancel Autofit if it kicks in) and parent the hair to Genesis's head, finally adjust to fit, least you keep all the movement morphs.
As for footwear, I'd be greatful for a solution here, Autofit sucks just as much before the Autofit correction tool on female clothing. I can see your idea working to point and would be fine for one-offs if you can get it aligned perfectly, but alas for me I'd want something practical for better work-flow.
Thanks for commenting and sharing.