What actual flying would need to be done to convert FAA to JAA? I'm guessing that if the candidate is already a JAA IR(A) holder plus FAA IR(H) holder, then the IR requirements are probably met, and then they would only have to satisfy the examiner during a check flight? Likewise with the CPL I would assume.
To go from FAA CPL/IR(A) to FAA CPL/IR(H) (assuming R22) you would need 20 hours dual (because its a Robinson), plus 35 hours pilot in command. The IR requirements would be met, by virtue of the IR(A) and so the CPL/IR check ride could be acomplished in one hit at around 55 hours....unless there is some excemption for the 35 hr solo by virtue of the CPL/IR(A)........
cheers