Sure, 2 for 1 is always good, however I believe EFT charges you a JAA PPL and no extra for the FAA PPL.
Load down a copy of the LASORS for ideas on the FAA - JAA conversion, bearing in mind that they could change once you get closer to actually doing it, also that this is the British, amended version of the JARs. All JAR countries have their own regulations, which are broadly based on JAR, however not entirely.
The Germans are new to the game and are not quite up to speed. Lots of changes taking place there. My club in Ireland was happy to accept my FAA PPL, however you could be right that some places don't know enough about it and will require a JAR cert.
Bear in mind that things usually turn out more expensive than you budgeted for.
cheers, IP