I think an earlier source arriving by barding (seeing how an earlier source would not have been in writing, only spoken lore) in different regions would have skewed the account far beyond how they (Meso:Bible) ended up. The Eridu find is a good reason to suspect otherwise, though, so I am probably shooting my own foot here. Nevertheless, my point is more about the distribution of written material as opposed to the spoken word.
Also, my opinion on the Babel account is that it was included in the Bible narrative as a tool to answer the question of the devout of 'why are there so many languages in the world'? That is, the story is purely allegorical, i.e. no tower actually exists. They did the best they could to account for the differences in languages, not knowing what we do today of lingual evolution and geographical separation. What are your thoughts on this view?
I should note I have had some of my own ideas on this (years past), but never really penned anything extensive beyond my mention in 'Godpyre'. I have found it interesting the origins in southern Turkey, perhaps investigating a root as far north as the Black Sea shores (maybe even Caucasus). Reason for pushing the latitude is I always thought the whole Ararat inclusion a mysterious survivor within the text; the story being allegorical, more local mounts would have sufficed to fill out the plot.
Look forward to more of your work on this.