I'll send some hate mail to Brussels if it's gonna be easy-cheesie to convert a MPL to a JAA CPL ME IR (aka fATPL), considering you have to go through hell to convert a FAA CPL ME IR to oh-so-high JAA standards
It will be a JAA MPL ie the 14 written examinations are exactly the same for the fATPL and an MPL. It is the flying/sim time that is different (assuming that it the part you were referring to when talking about converting from an FAA CPL).