So, copies of the FAA release to service sent to EASA? What is wrong with that? Accompanied by a cheque for Euro 1000, perhaps.
FCL is something else of course. The majority of private N-reg owners are there for the FAA IR.
But then everybody knows that if the certification and FCL are addressed reasonably (e.g. an FAA PPL/IR swapped for an EASA PPL/IR, and FAA STCs and 337s accepted) nobody will be on the N-reg anyway.