Western Greek doesn't mean foreign, IIRC it just marks the buildings that have been placed by script in eleutheroi settlements because the game engine doesn't allow something else. E.g. the starting reform markers and expansion markers are 'Western Greek' in all starting eleutheroi settlements.
The building trees of nomads are way more complex then that of the other factions. Very often certain 'buildings' of the nomadism build-path block pastoralism and the other way round. IIRC there's no way to have 'buildings' that allow recruitment from both nomadism and pastoralism but the regional barracks don't block one of the both I think.
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