*is there a module already out there to prototype the iOS combo box?https://i.stack.imgur.com/uZ0QF.png
Not that I know of. I remember that Jordan Robert Dobson once helped someone out with making a perspective scroller like the combo box. Maybe he can give you some pointers on how to build one yourself.
I found Raphael D'Amico’s https://github.com/raphdamico/framerKit, which has this as a picker component. There are some scroll bugs if you use it with the current version of Framer (probably our fault ;)), but it should be a great start.