Islands, maybe a secret route somewhere

[Roger Smith]

As for the island itself, go for it. That's the main reason the Vasty Deep is so huge, for all kinds of islands to be found there.

Secret routes (aside from the Void Gates) are being phased out, if they haven't already been entirely, so that's a no-go.

The closest you could do would be Teleporters for your base, to Coruscant and/or the Nexus. They'd deposit you at random locations within the verse you're going to, but it still beats the intervening travel time.