Change religion to culture.

[artaxerxes]

Those ideas you're suggesting could make the attempts of Seleucids and Baktrians to 'hellenize' the East more apparent in the game. In EB you really only have the military settler colony, but one of the great problems of those dynasties was their attempt of attracting Greek and Macedonian settlers to the east, so as to stabilize their rule over a population otherwise rather alien to their own culture. Fx the Seleucid empire could start out being very culturally weak, and then if the ruler is able to divert focus to strengthening hellenic culture, you might be able to stop provinces from revolting.

This would also better represent the disintegration of the Seleucid empire. In EB it's usually conquered by Ptolemies, but apart from the easternmost provinces, it doesn't seem to have the cultural difficulties that the real Seleucid empire had...