Adoption doesn't pass on kingship, tribal affiliation or priesthood. Someone adopted into a Levite family did not gain the ability to function in the priesthood.
Yeshua is a priest after the order of Melchisedek anyway.
Well, kingship and priesthood are Jesus' because of who He is, not His boiology. So it's irrelevant.
As for "affiliation" I am not sure what you are saying. Someone who is adopted and stays with a tribe for his entire life is not a "part" of the tribe? He can never marry, or must find some other "misfit" to marry?
SD