Well, I doubt we will come to agreement here.
God is a Spirit. If He leaves, it is His Spirit that goes. And this is the biblical definition of death, ie., separation from Gods Spirit, from Gods life. How else could He forsake Jesus? Physically?
IMHO, you are reading into the text. Notice He did not say, "My spirit is going to heaven". He said, "Father, into your hands I commit my Spirit."
This was His confession of faith.
Just like when He said about Lazarus, "This sickness is not unto death", and then Lazarus died.
In both these cases He was speaking the end result, calling those things which be not as though they were, because He knew what the promise of God was, and believed that it would come to pass in the end, not because Lazarus would not die for a time, and not because He was not separated from the Father for a time.
Just as He believed that God would raise Lazarus from the dead, so He believed that God would raise Him from the dead.
Peace...