You are correct, BB. To claim God is subject to some pre-existing standard is no different than the question: “Well, where did God come from?”
The point is that everything comes from nothing or everything comes from something. The eternal must have been a something rather than a nothing, because nothing always gives rise to nothing.
The eternal something must be sufficient to account for all that is.....to include the eternal moral order.
That's exactly the way I see it, too, xzins. The Word of God, the Logos, is the complete specification of all that there is or can be.
Praise God!