Is this not a matter of building experience?
Now that we have NPPL - Could all new trainee's not start with the NPPL with an NPPL Instructor to qualification, and then train up to JAR standard if and when required with a JAR Instructor? This would create a definate need for both sets of career instructors, and a defined route to licences and qualifications.
NPPL(SEP) - build experience and have fun - JAR upgrade - twin, IMC, foreign travel etc.
Of course, the only stumbling block currently, is the lack of credits toward the JAR PPL if the NPPL instruction has been with an NPPL FI.
Hour builders - history has shown that the Airlines will take the best they can get at any particular time, be it a 250 or 2500 hr pilot. If the Frozen ATPL's wish to instruct to build hours, then perhaps they could work for the Approved Integrated schools from where the Airlines could hire.
Let's have a course for NPPL FI's that focuses on flying skills, teaching, and having fun within recreational aviation.