I believe opening the convertible roof from a distance is available as an option.
Whether in the US or not, the option is available.
Not sure what it would take to upgrade your car.
Does the key have 3 buttons built-in.
Usually the first button unlocks the doors with a click, and if you then hold that same button for an extended period of time the windows and sunroof open.
Not sure if its the same with the convertible top.
Any convertible owners have first hand experience.