Yeah, I think I'd be looking at AV or CM status, probably CM to be honest because if you get to a high enough level they do have upgrade certificates (program was copied from CO / UA). UA status is probably unobtainable for you unless you fly to / through the US (need 4 segments per year on UA metal). NH status sounds definitely unobtainable beyond this status match because you have to log 50% of your status miles on NH metal, so would require lots of flying to Asia.
Others to maybe look at are A3 and SK, depends on the far classes you fly on when you're paying, but still thinking CM would probably be the most beneficial overall if you can meet the qualification.
The key missing information is do you buy business class or high fare economy? Or only discount economy? (that's the toughest to earn any status on these days).