Changing original hex owner?

[Sabratha]

Well, I'm asking mostly because I'm trying to include new factions that may emerge during the game, for example the Transcaucasian Republic and its war against Turkey.

The game does base the production and especially deployment of new units on the "original ower" of the city hex. Is there a script that can be used to change the "original owner" of a hex as a result of an event?

It would be easy to do if we had a map editor, but without it I am left trying to do this via event, but can't find the proper script.