I've put together a mock up of what this could look like in Collect: https://www.figma.com/proto/Dxe1UF9reRdLYy8o5jishW/Minimal-automcomplete-select?node-id=24%3A1774&viewport=590%2C311%2C0.36822032928466797&scaling=min-zoom.
Interested in any reactions or feedback!