But if you make it possible to have indian elephant in Epirus, Egypt, and Carthage because they breed them, wouldn't that open a flood gate? If playing EB is a alternate retelling of history, then say Carthage conquered all of Iberia and Arveni conquered all of Gaul and became a big power, they could have built breeding garages for elephants they bought from Carthage. Or say there is some charasmatic consol of Rome who fought elephants and decided to import them and breed them within Rome itself.

But of course there is the arguement to set everything up as it was in 272BC and ignore actual and/or possible future changes. (ala Carthago Nova)