Your review is a labor of love. No doubt it helps organize the thoughts by actually writing them out. If I might suggest a couple areas of refinement. The process of syncretizing the imported Yahweh deity with the indigenous gods El and Baal, was a painful and long process. Gradually the iconography and theophanic language was shifted to Yahweh by those with the power to do it. It seems largely a political strategy of leaders such as Josiah to unite a small empire with a state religion. Religious purists likely chaffed at expressions like "Bull Yahweh" and the occasions wherein worship of Yahweh involved the use of bulls. But political power and time win over. Incredibly the OT contains both religious positions tenuously side by side; condemnation of Yahwism with Baal and El iconography, and overt acceptance of this transition.
Regarding Yahweh's origin from the south, the Kennite hypothesis convincingly put the pieces together many years ago. Conclusive, no but the OT assertions to that effect are pretty hard to explain if not accurate. At least it was widely believed that Yahweh was a Edom/Medianite deity that "adopted" Israel as his people.
I'll also suggest pursuing research regarding the "10 tribes of Isreal". Modern scholarship might use the term as a nod to earlier work in reference to the Northern coalition/nation of Israel but in doing so are not literally suggesting 10 of an original 12 are historical tribes. The "tribe" names are often simply geographical or etiological creations not sons of of a patriarchal Jacob. The number 12 has cultic symbolism.