Think you can get it from proton. Did you leave the metal clip inside A pillar? Everytime we cabut the trim we need to remove the clips from pillar and pasang balik to trim leh... Anyway if I were you and the clip broken, I'll try to double tape it back lol..

replacr the driver side one?

i can think of :

try troubleshoot car key first.
use spare key. the main key put far far away.

other than that is maybe the central actuator kong or maybe alarm module.