This is a pipe dream. Why would this exist when Sumeria has a UI that produces science next to a river? Why would this exist when Egypt has agriculture bonuses from rivers and is also an early wonder civ?
Does no one bother to recommend civ ideas that actually *add* something to the game? It's totally fine that you have your favorites, but it would be great to see that balanced by some pragmatism. So sure, you have your little pet design for a mod; now stand back and look at the bigger picture please. Babylon does not add enough as a concept to VI to justify development. Sumeria has the Akkadian speaking leader. Sumeria has the Ziggurat and the science and the river bonuses. You have Sumeria this time around. Live with it.
To be honest my justification for Babylon is pretty much "Gee I'd like to see Hammurabi and his Code" combined with some sort of resigned "it is here since civ1 so it'll be added anyway"

You know what, I may rethink my choice, because I realized that'd be consistent with my other preferences: that I don't wanna see goddamn Zulu and Gandhi in every civ game, so it makes no sense for me to make an apathetic exception for Babylon...