STN was a base till 2009. The short history lesson, AWW set up a front company there to fly BA contracts. BALPA put their foot down and required British pilots fly BA freight. AWW now leases planes to GSS to fly BA freight but no Atlas crew are involved and there is a less than zero chance STN would open up again as an Atlas base.

We do have pilots living in Europe and Asia. If you can hold trips that start with a DH to Europe it could work. But if your trip starts in the CONUS it will up to you to set foot here as the gateway travel only applies in the CONUS.