After an impromptu upscale bar/lounge crawl with the wifey the other day.....
A shoe that can easily go back and forth from high heel/wedge to comfortable flats w/o much, if any, tooling or carrying around extra parts. She also brought a clutch purse
Wifey was dead the next day from foot pain of walking between places.
Tbh all you'd really need to do is make the heel's stick a lug and the shoe's heel a spot to catch it. Line the lugs up with the hole and twist it to lock it in, twist again to unlock it and pull it out. Or could just use screws, maybe a long one through the bottom (and inset a little to avoid clicky clacky screws) that doesn't fit all the way to the human heel but catches the shoe.