He did know good and evil, He had the same body we have. As I said your getting dangerously close to the very old heresy of Docetism. Christ came to be like us in every way with the exception He never sinned. He had a corruptible human body which grew and decayedThink about the example of Adam again before the fall. There was no death working in his body until the knowledge of good and evil. The use of the word fallen implies that Jesus knew both good and evil doesn't it?
If Jesus was never disobedient then he didn't know any sin until the cross. And it wasn't even his iniquity he was bearing. Isaiah 53 says the Lord has laid on him the iniquity of us all. So he took our sin so that we can have his righteousness. That means the cross is an exchange.
I am of the Circle, a follower of Eylon in the great Romance