...both sides in the fourth century debate took Wisdom/Word/Son to be a person at the beginning with God, the difference is Arians maintained the distinction that the Son was created and subordinate to God...
Bingo again. The Arians 'literalized' word pictures. They made too much of the expressions "son' and 'beginning' having been hundreds of years distanced from the esoteric language. When Wisdom was 'created as the beginning of God's works' the writers did not literally believe there was a woman in heaven that was created to perform for God. It/she was a hypostasis of God's power. JWs are similarly literalizing the words and making much noise about their uninitiated take on these passages.
I'll remind you that it's my position that the Catholic fathers had themselves mistaken metaphor for history, in large part because of the success of the Gospel stories that euhemerized and embellished the Logos concept into a Roman crucifixion setting. The Arians simply took it a small step further by reducing the Logos to a demigod because of focusing on descriptions such as 'created' and 'son'.
The EL/Yahweh and Yahweh/Michael parallels contributed to the 2 powers concept from a different angle.
The main point is that Schafer and others have demonstrated that there were indeed pre-Christian and early Christain concepts of God that eventually congealed into the Trinity doctrine formulation. The belief that the Christ was a manifestation of God was not secondary to Christianity it was a fundamental underpinning that literalizers complicated/ denied.