Let pops of a certain culture group assimilate to a culture within that group that is assimilated. For example, If I'm Seleukids, let the Iranian pops assimilate not only to Macedonian culture, but also to Persian culture since that culture is integrated. Perhaps tie it to cultural decisions such as 'Promote Cultural Administrators'. This would also also for historical changes such as Anatolian becoming further Hellenized under Roman rule (as is, Anatolia would become Latinized rather than Hellenized).
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