Have the Assyrians be able to form an independent state or have someone help them to do so.
Oh and is it doable?
Oh and is it doable?
I think you need a demographic Assyro-wank to dominate over Mosul Vilayet or Nineveh Governorate and eastern Syria.
Or avoid Assyrian Genocide.
Maybe if a mass exodus of Middle Eastern Christians migrated to the area, it could be viable as a state? Of course, it wouldn't really by truly "Assyrian" then so that might not fulfill your requirements.
It would be more plausible to have the Assyrians exiled to Palestine or Lebanon....
I bet butterflying the Assyrian Genocide would be a good start. How much land did they cover prior to that?