Updating nationality traits during game

Every faction has its own cultural/nationality traits for every familiy member.
For instance, Greek generals may be Spartans or Bosphorans, while Seleucid generals may be Persians, Armenians, Macedonians etc.

However, as in history happened, I thought that a faction may "unlock" other nationality traits after conquering and assimilating a region.
I.e. the Seleucids conquer Carthage, after 10/20 years they will be able to get Puno-Hellenic or Carthaginian husbands for their family women; or the Celtic factions may obtain Celto-Hellenic or Italo-Hellenic generals if they conquer Greece/Italy and mantain them for a number of turns (in order to simulate the progressive assimilation of the conquered people).
Obviously they won't be available until that moment, unless a player trains a client ruler.
Simply I thought that having a great empire but generals from only few regions of it, after some years, was a little unrealistic.
Otherwise factions like the Eastern Greek ones shouldn't have Egyptians, Bactrians, Indians, Sogdians, Syrians etc. in the family but only Macedonian generals.

Is possible to script something like this?

Maybe possible though recruiting in some area, scripted in export_descr_VnVs or else (never try to change most M2TW files except EDU and EDB). I remember my english campaign on vanilla M2TW (not kingdoms), when I got a family member comes of age in Nottingham upwards (including scotland), and scotland still exist, they will got "hate Scots" traits, if they are born in Caen, france, italy, or jerusalem, they won't hate Scots. I think EB II team will just try to implement the condition... but I'm not 100% sure...

Nice idea and will be great for role-play!

I think it would be. After all, it recognises when you conwuer a particular territory (With the information about each territory traits). Also, great idea!

I believe the plans for ethnicity traits in EB2 is to have only one group (not a group for every different faction) and some factions will gain access to some new ones as they expand. Of course, certain factions will never get access to some, based on historical accuracy.

Although, I think ethnicities are still in the concepting stage.

MAA: What do you mean with only one group of ethnicities?