I attended the AMEX/BDO/CX credit card 'roll out' event this week here in The Philippines. In time you will see CX introduce cards in all their markets.
But right now you need to move your Amex points to the Starwoods Card and then to CX.
Simply using AMEX *wood card - 1:1 conversion + 5000 bonus Asia Miles every 20000 points conversion (if that has not been changed).