Off track slightly, Whirls, what do you mean "maintain" a JR rating? Do you have to do x amount of hours per year? Is this another strange Euro rule?
TiPwEiGhT, check out the Canadian schools on the net as most have info on the conversion. Medical, flight test, theory exam. All pretty straight forward providing your not a complete muppet. Job prospects would be the same as a 600 hour pilot anywhere I guess. Better than a guy with a new licence, but still not a lot of real experience or hours to apply for the good jobs.
All fairly simple compared to the rubbish overseas pilots have to go through to fly in the UK.
Contact these folks and they can fill you in on the details:
[email protected]