I don't think it's as easy as just changing some names and moving on, mainly on a personal level. The attachment to this world has to be immense after all these years. I don't think Kurvitz and co. want to just make something set in a fantastical post-soviet setting, I think they want to work in Elysium specifically. At least that's how I would feel, were I in their shoes.

Second, there is so much detail in the world that both gives it character a and is most likely copywritable. They have to come up with new, legally distinct versions of the innocentic system, Dolores Dei, the Coalition, the >!pale!< and the isolas etc etc. I think it's much more likely they do something completely different than something akin to "legally distinct DE". Though if Kurvitz just ends up bitterly doing nothing but relapse on his alcoholism then that wouldn't surprise me either. Again, that's probably what I would do in his shoes.