With regard to the Aer Lingus 332s, these aircraft are already committed; also, not all are PTV equipped, the remainder being refitted over the Winter.
There are 333s available, but these are not PTV equipped; this shouldn't take long to do and again, it should be pretty easy to reconfigure Y class seating to 32". Aer Lingus would be more than happy to get shot of a 333 for the Winter, I'm sure.
The aircraft should have sufficient range for DOH-KUL, being already regularly tasked for DUB-ORD; presumably late night departures will be planned?