Have a look in an ATR cockpit and you will find that they nicked all the bits out of the Airbus parts bins.
I doubt very much that anybody will be packed off to the ATR fleet at CFE as it is in the process of being phased out. Even if it did happen you wouldn't be there very long.
As a general comment, if CFE is in the process of being integrated into EOG, and EOG is the traditional training ground for CEP's, then it would follow that cadets will end up on the RJ100.
An airplane is an airplane, it's the lifestyle and remuneration that comes with it that is important. In a 30 year career with BA you will see lot's of both!
Harry