Keep in mind that some of your characters' Knowledge checks will be more difficult than usual, given their background. I will allow them, considering that your characters, to varying degrees, might have learned about the galaxy beyond the Veil via holos, data records, etc. They will, for the most part, be difficult checks to succeed at, rather than just waving my hand and saying "you guys are ignorant of the galaxy, due to your isolation on Akrultos." The difficulty will represent the extreme unlikelihood of your character happening to have stumbled upon the Knowledge you seek (e.g., in this situation, the chances would be very slim that Tajanna would know much about Espos).
In simpler terms, you characters' Knowledge bases have far less depth than your average individual, and you are less likely to recall info, depending. However, the longer you are in the civilized galaxy, I will allow that this might improve, via knowledge learned outside the narrative scenes of our game.