Half banana: 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.
Yup, I'll at least post key points and arguments
It is a critical area of study capable of busting anyone's trust in the divinity of scripture.
I agree HB. The JW view of scripture (and, most fundy churches) cannot be sustained once you see that the chain of inspiration that they claim exists, does not exist.
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.
Part of the topic will be to test that possibility and compare it to both Egyptian and Iranian sources. As far as Hellenic influence is concerned. Aeschylus was an ancient Greek tragedian (playwright). Think about this quote from his play Eumenides, I'm not claiming any great spiritual knowledge of him, but note the language he used.
" ... I, as a prophet, cannot lie. Never from my prophetic shrine have I said anything of city, man or woman But what my father (Zeus) has commanded me. This plea of mine must override all othres, Since it accords with our great father's will."
Aeschylus was born around 525BCE, withing a couple of hundred years, Greeks ruled over Palestine and Greek colonies were established in Galilee and other Palestinian provinces. Think of the affect this likely had on young Jewish men.