Continuing my research I have looked into sourcing Platinum from Alberta and have concluded that Oceana is well situated to be a mid-way point for Platinum (to ship to Waterloo) with Tea close by on Curacao (to be shipped back from Cortez to FP14 in Alberta) and with Curacao as a sell-point for Diamonds (which can be brought back from Waterloo).
Attached are my findings, which are made available to all Gateway pilots: