As " relief Captain" this position is only RHS no flying from LHS and according to NAS is P2 time only. Some experienced 737/ 767 guys passed interviews and sim and have had start date delayed due the tech problems with the 787. They were told without the 777 rating and time on 777, LHS would be " quick" maybe 2/3 years, which for a wide body is quick. One guy has 5000 hrs 767 but he still has to wait " at least" 1 year for LHS. It's basically the same as " relief command" at CX, i.e an FO job with approval for monitoring at cruise stage.
The Type rating is done in the RHS by the way.better off on 737 at NAS if you are thinking of money and command time