IAG it, rebrand to Aer Lingus Regional
Like most of what mik3bravo says, but why on earth brand as EI Regional? It needs to branded as BA. That would work on the trunk routes at BEE's major hubs, but a lot of peripheral flying (eg, most if not all regional France from SOU) would have to go in order to turn the operation round. Rationalisation would be needed at LCY, where they widely compete at present.
The fact that Stobart have already started flying a couple of EMB's (or are about to) for CFE could be described as interesting.