[...] I don't understand what you are trying to say. Please elaborate!
Not much cost or complexity, but finding a 2-stage camera button that fits within 0.6mm height is a challenge. You are very welcome to join the hunt! (2.2mm if it fits in a cutout)
Andrew is in charge of the keypad and has full creative freedom in this. This was his latest render of what he had in mind, but some minor details will change. Happy?