Well, nothing is really impossible. Look at the geopolitics in the Eastern Europe, you-can-guess-where. Pretty much offering/enforcing a citizenship, while being a immature "state" is actually a reality. There is nothing criminal for Core to iRPly do this kind of stuff, because... What prevents them from doing so when they have bases, fleet, economy (well, their status is another question though)? If they iRPly can, than they...Can do it. And obviously iRPly it is up to everyone to accept their terms or not.
And I think southern Omicrons pretty much revolve around Core. At least they have a major influence on the common barycenter.