Thank you for the questions, appreciate the analyzing...
Historically that doesn't add up, as unless they edited Genesis completely... YHVH already was called that:
Genesis 4:26 A son was also born to Seth, and he named him Enosh. At that time men began to call on Yahweh’s name.
Genesis 12:8 He left from there to go to the mountain on the east of Bethel and pitched his tent, having Bethel on the west, and Ai on the east. There he built an altar to Yahweh and called on Yahweh’s name.
Genesis 13:4 to the place of the altar, which he had made there at the first. There Abram called on Yahweh’s name.
Genesis 16:13 She called the name of Yahweh who spoke to her, “You are a God who sees,” for she said, “Have I even stayed alive after seeing him?”
Genesis 21:33 Abraham planted a tamarisk tree in Beersheba, and called there on the name of Yahweh, the Everlasting God.
Genesis 22:14 Abraham called the name of that place “Yahweh Will Provide”. As it is said to this day, “On Yahweh’s mountain, it will be provided.”
Genesis 26:25 He built an altar there, and called on Yahweh’s name, and pitched his tent there. There Isaac’s servants dug a well.
El Shaddai means God Almighty, Yahavah means Lord To Be, Ahayah means I Will Become...
God doesn't have a 'name', it has descriptors, as everything comes from the Source (CPU) which is beyond form...
Thus it creates forms for us to understand... Thus YHVH/the Lamb (Yeshua) are Divine representations (Elohim).
Thus Exodus 6:3 is clarifying that God Almighty appeared; yet to be clearer here is a name meaning, Lord Who Appears/Becomes.
Full name of Yehoshua is the Lord Who Saves; thus these are just aspects of the whole...
Yeshua is the Right Arm of the Lord who breathes reality into existence (YHVH).
In my opinion.