Highly likely that any and all externals who want it will find themselves on the A320. Previously, we ran shortened courses for current A320 Pilots (possibly all from J*) so if there’s enough starting at once they could possibly do it again.
There’s an interesting situation playing out at the moment. Previously, you could state your preference but ultimately went where you were told. Now, Regional Pilots can bid for specific courses and a large number of them don’t want to move to Auckland. As such, they’re bidding for SO positions or requesting Christchurch Domiciles for the A320, which aren’t guaranteed.
I have my suspicion that this EOI for externals could be specifically targeted at getting more A320 FO’s into Auckland, due to a combination of regional pilots struggling to transition and others declining Auckland.