I don't have Enemies Beyond yet, so it may be in there, but is there a special Highborn Homeworld? I've noticed that all of the other world types (up through Enemies Within) have special variants, but none for Highborn.

As Highborn is more a class than a specific planet (I guess thats because they are beyond the usual challenges and work of their planet, and might also have the opportunity to travel more than others), I am not sure if this would even make too much sense.

I could rather see the background giving this origin an interesting part. Like a Rogue Trader Fleet Noble could indeed be...a Rogue Trader