I think I'll incorporate this into a timeline I'm working on. I have a polytheistic Levant under Egyptian aegis after the collapse of the Assyrian empire. I could explore the idea there, if WilliamPenn is interested in allowing it. But honestly, I don't think even that set up needs to be the case, it could have different origins. You would need the Judean religion to stay polytheistic, yes, but the Judeans could be inside Egypt itself, rather than Judah be under their influence. There were expatriate Judean communities in Egypt, generally founded by merchants and their families. Egypt welcomed these communities to live within its territory and protection, the same way they welcomed the Greeks in. It helped build better trading relationships with Egypt's neighbors.
These Judean expatriates would want to cope with their adoption of Egyptian tradition and culture and help them retain a sense of importance as they violate Judean traditions and culture. Yahweh would be associated with birth, ie the importance of the Judean heritage and allegiance to Judah, Baal with life outside of the protection of the holy covenant people, and Osiris with death in the newly-inherited homeland of Egypt and the inheritance involving new promises of paradise and reward.
I'm thinking, if this was the case, Jabulon would join the Egyptian pantheon of gods if society became tolerant of their cult's participation in civic life. Jabulon could have his own temple, priests, retainers, all luxuries supported by the Egyptian king or satrap with the intent on remaking Jewish expatriates into Egyptians. Over time, who knows if the fusion could develop into a kind of Trinitarian Monotheism much like Roman Catholicism, with Yahweh as the Father, Baal as the Son, and Osiris as the Holy Reaper. Then the Egyptian government may be a little more worried.