Originally Posted by
guv1976
I think the biggest problem with your plan is your assumption that you will be able to find two premium-cabin seats on the same flights for your exact dates of travel. It's possible that you will, but it's far from certain.
Award availability will be a major issue. Awards are far from guaranteed.
SIN-DPS is a short flight: buy with cash if needed.
You will need to study the award rules of the ffp's you plan to use very carefully. With some ffp's award routes are limited.