Other possibility is to fit central locking motor to rear door mechanism and use switch from electric windows to control it. Motor needs 1s pulse to open/close. My y10 has central locking at rear door, that gave me idea . But it only locks/unlocks, it doesnt open.
I think you'll need a popper which is different. Needs more power than normal C/L because of the type of mecheism. I could be wrong though.