As China bans new cars with unsafe doors, Australia risks becoming a ‘dumping’ ground
(theconversation.com)
The door skin is specifically designed for a slimline hidden handle. It wouldn’t be too difficult to build a retrofit an external handle but it will look like arse.
The door skin would need to be modified to accommodate a recessed external handle, which wouldn’t be impossible, but would require a bit more specialised labour.
I’m not saying it can’t or won’t be done, but the bean counters would probably just prefer to replace the entire door assembly.