Very unlikely. Like I said above, we have plenty of reports of people being restricted to two seats - and BA agents stating that only 2 seats are opened up per flight - and no reports of subsequent availability opening up (which, of course, is not conclusive proof that it can't or won't happen).

Like I said, the J cabin fills up fairly nicely for Aer Lingus, so they don't need to "give away" seats (yes, I know they get paid for these redemptions too, but it's probably not as lucrative as a cash redemption). December is also a very busy time on their transatlantic routes. If availability opens up at the last minute, it may just be for EI members.