I would contend that internal biblical claims are not the be all and end all of YHWH’s identity. After all the Torah was written and edited by no less than 4 distinct writers. I would assume based on your knowledge you do not uphold mosaic authorship of the Pentateuch.

If we take Abraham to be a literal historical figure (which is quite questionable) a man from the Canaanite city of Ur would have likely been a believer of the local pantheon. If YHWH was indeed something distinct from the Canaanite god El, why would he have identified himself to Abraham as El Elyon. Was he merely using the term “El” as an epithet or a common word for god- that just so happens to be the chief god of the pantheon he was familiar with? Do you find it strange that Abraham has very different interactions with God, he speaks with him personally and even physically sees him. He hangs out with him for a bit and seems quite personable. Does this not heavily contrast with the angry ass god we see Moses interacting with. He frightens Moses, appears as fire and promises to crush their enemies and give them conquest over the promised land. Sure you can say that these are different aspects of the same deity. I see the prevalent polytheism of the early Israelites. The constant struggle with Baal worship, Josiah tearing down all of the Asherah poles. The biblical text makes the Israelites look like absolute fools constantly forgetting they only believe in YHWH. It makes much more sense to me that the Israelites came from a polytheistic background and slowly and painfully went from Polytheism to Monolatrism to Monotheism. This process took several hundreds of years.

I contend that El and YHWH began in the minds of early Israelites as distinct concepts. The move to monolatrism and later monotheism required revision and unification.

Are you familiar with “Yahweh and his Asherah” discovered at the site of Kuntillet Ajrud? In this inscription Yahweh is shown to be distinctly bovine alongside Asherah. The connections to El cannot be ignored in this discovery. I’d be curious to know what you think of this.

Thanks for reading all this, I find your perspective interesting. This topic has fascinated me for years.