A320
If you look at your Licence it would say A320 not 321, earlier this year i transferred over to the Bus and did the whole course for the 320.
If your rated on the 330 could you go direct entry to the 330 or start on the 320 and join the Que?
Join the Que A320baby, or if you did manage to get a main base like Manchester it could come quit quickly. Manchester is the Hub of the world for TCX at the Moment expect to see more routes in the future, at least thats what I'm hearing on Cabin FM.
Enjoy the process and just be yourself.