Eternity is in the realm of being, not becoming. You have your characters performing actions while time stands still. That doesn’t work in either Plato or Aristotle, and there are no other plausible models.
Unless you want to throw credibility out the window and just write science fiction with magic in it. That works, but you don’t get any deeper truth out of it.
You do know Plotinus, don’t you? The chap who gave Christianity the Holy Trinity?