I will look forward to a summary of your essay (if not the whole thing!). I think the choice is excellent, an area I would love to investigate in depth myself. It is a critical area of study capable of busting anyone's trust in the divinity of scripture.
So much of adventist and therefore JW belief comes from Daniel and the facts as you have mentioned about the Persian and the Hellenic world is very germane to the development of messianic belief. It links the middle second century BCE Greek philosophical view with the NT world. Not surprising then that the nominally Hebrew Daniel is more accessible and less alien to Greek Christianity. After all it was Greek philosophy and NOT JEHOVAH which gave us the 'logos' which is central to Christianity along with much else from that era.
Keep us informed!