Did you deploy K8S on AWS? If so can you add any details about how? Or are you using K8S elsewhere? I love AWS but planning on spinning up on GCE this weekend to play with K8S.
Depending on how many RIs you have, maybe our custom shapes, much lower prices with per-minute billing and sustained usage discounts, and BigQuery vs RedShift you'd still come out ahead. You could always try your hand at reselling your RIs on the "market".
Would you rather run pgsql by hand or K8s? (And yes, I don't want to make you choose, that's just the current state of the world).
Disclosure: I work on Compute Engine, so of course we want your business.