Contrary to what salt has advised tfung, it is definitely not possible to go through asia even as a transit as you are only allowed TWO intercontinental gateways arrival/departures - with the sole exception of North America. So that would pose the problem even if you decide to only transit through asia.

You have to get the ticket reissued first off. There will be a charge of US$75. Bring it to any oneworld carrier. Tell them what you want to do. Some may catch it , others don't - of what you intend to do. You might still get away with it!

I had a 6 cont ticket recently reissued because it was expiring and I had to reroute it. CX reissued it for me, but the way it was reissued, well, let's just say that I suddenly have another year to do the ticket! Of course eagle-eyed ticketing agents will catch the mistake, but usually as long as the check-in agents know their minimal stuff, I can get away with it. (And from experience, only Cathay Pacific check-in agents scrutinize every detail on the ticket. I thankfully do not have any more CX flights on the rest of my OWE ticket)