stick two hours-builders in the aircraft and send them off together
But at the end of the day this doesn't matter if you're planning to get US ratings and then convert.
Doing it this way, you can effectively hour build for as little as £20-£30 per hour.
There seems to be schools now specializing in the 'conversion' route, and the one school i attended for my FAA ratings, specialized in training for the FAA ratings, to JAR tolerances and procedures, with a view to conversion (they employ JAA/FAA dual qualified instructors).
Seems to make sense. The place I went to in the US offers a course to take an ICAO PPL holder (JAA/CAA/IAA etc) with 150hrs all the way through to JAA fATPL for £13,800 including conversion costs ( including issue of FAA CPL/IR not including ATPL ground exams ). If you don't have 150 hrs they pair you up with another student to build hours the FAA way until you have the 150 hrs. Ok, under JAR these hours might not count, but it doesn't matter, as you will have more than enough hours (JAA hours) for JAA CPL/IR issue. You also exit the course with 40hrs multi time.
Cheers
EA