Kyu

the birth of a god part is only a short section over the end of the Jenova part leading into the outro (starting at 3:10) I figured you were looking for something less subtle but I remembered this video and thought it was a good case for doing it since there's an existing example of the tracks mixing well together. For the same reason it might give a bit of inspiration if someone does decide to do this remix (not a job for me right now i'm afraid)

Symphonic Odysseys did something like this in their encore. They did a really interesting medley that layered let the battle begin, jenova, birth of a god and one winged angel over each other. The execution is a bit awkward in places but I really love the concept and there's a bunch of sections that I think are pretty inspiring and show that these tracks do gel together.