@Herja In regards to the Cardia piece, couldn’t a second / sub grid be added for cardia? Even if its just the Arx Embassy distract in some cardian capitol?
add some story elements to help drive story over there and suddenly you can both have your cake and eat it too 
People will always flock to where story is, and if staff wants to explore and introduce new concepts and places like that, i think players would very much be open to the idea. Make a quick story teller Primer for story tellers in Cardia prps and you could start the story and adventures in Cardia in Arx.
