Can't help but feel that if this is how EI are thinking, a wingleted 757 is the answer, together with a few more for SNN services, with the entire 330 fleet being kept in Dublin. Either that or some 310s if cargo is a requirement. bmi are replacing their 330 MAN-IAD with a leased 757 because they want to expand LHR services.
The more I see CO make use of them the more I like the idea for non-DUB services. The A320/321 don't have the legs and a 319 seems a bit small for a JFK run unless it was configured mostly business class in a semi-LH/Privatair kind of way - and niche ex Cork didn't really work out for Jetmagic.
As for pilots for these 310s/757s - have the 146 pilots been sorted yet?