What’s hilarious is once Anakin has turned that first moral corner, Palpatine essentially fesses up that he actually doesn’t know how to keep Padme from dying.
But Anakin keeps on Sithing with the vague B.S. promise from Palpy they’ll find the secret out together. How? If Palpy didn’t learn it from Plagueis already, I don’t think he ever would.
And since Anakin’s visions revolve around Padme dying in childbirth, there isn’t exactly a whole lot of time to find the secret, if it exists at all.