Actually the Antigonids would be 'Asia' during this date, since they were satraps of Asia.
Asia or Syria would both work for me. The problem is that Seleucid as a country name is so entrenched in our thinking that making the approach fully consistent and calling them Babylon wouldn't work.
Ideally though I'd say the best approach might be too make the kingdoms of Asia, Syria, Egypt, Macedonia, and Babylonia. Formable nations for at least any Greeks ruling a certain amount of cities in the region. That way we can switch at liberty when playing in the free for all that the diadochi wars where. Until you've conquor enough to call yourself the heir of the Alexandrian or Macedonian empire that is
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