Definately CHC International or Eastern.
If you got into the EMS contract you would have to be a copilot until you got some 76 time. Definately, make some noise to the CHC management.
Ensure you talk to Transport Canada regarding your licence conversion first and then organise your visa through the sponsoring company.
Gidday Offshoreigor! Met any ozzies lately?
Regards,
CB