Miko Lizazi

Hi Dogballs, I know this comes after such a long time but I have a convertible from Japan with the dreaded two gummy buttons IR key and wanted to convert to RF, is it possible and how do I go about that? I don't know if convertibles have the same antenna as saloons or use something else (Perhaps the rear view mirror) as a transmitter. Do I need wiring to change from IR to RF or something else? I have searched and couldn't find anything on convertibles. Really appreciate your help.