In other words, nothing changed about Jesus except for the form that he took? Is this what you are saying?Jesus was "in" the form of God and emptied "himself" from the only thing he was "in" in context. Then he was "in" the form of a slave, a human being under law born of a Jewish woman. (Gal 4:4).
The verb "empty" with the direct object of himself (what was emptied from being "in" the form of God) makes the form of God and the form of a slave mutually exclusive.