NAUsername
The JAA doesn't really approve of good ideas - they tend to be squashed at the committee stage
FFF
The CAA (note not all of JAA - another of those good ideas not taken up) introduced an exception earlier this year. A holder of an ICAO IR can now, in the UK, achieve a JAA IR on completion of 15 hours training and passing a full Initial IR Test.
This is not in fact much saving for an ab initio after travel costs have been taken into account, and the fact that the first 40 hours of an IR can be on simulator anyway, and that you will not have an approved IR. However if you have an FAA IR for example, or want both, then the insane requirement to repeat all the training no longer applies.
P.S. the training requirement for an approved IR course is 55 hours, 50 with a CPL.