I agree that God in his infinite dimension of existence is outside of time and that is also why he knows the end from the beginning as per Isaiah 46:9-10 and also why he as Paul said in Romans 4 "calls those things that be not as though they already were", also.God is outside of time and the WORD of John 1:1 does have a body in verse 14!
Therefore, one could just as easily say that in Genesis 1:26, God was actually speaking to Jesus through Adam and through Eve and through all of Adam's descendants right down to Mary and through Mary to Jesus and being God's infinite dimension of existence is outside of time.
Here is some proof of this also from Paul in Romans 8:29 below.
Romans 8:29, "For those who he foreknew, those he also predestined to be conformed to the image of his (human) Son, that he might be the firstborn among many (human) brethren".
Colossians 1:15 is also proof of this as well, for Paul is actually calling Jesus "the firstborn image of the invisible God of all creation" and just like he also reveals in Romans 8:29 and even though Jesus did not come first in the order of time, he was still the firstborn with God and just like Jacob and others were who weren't born first in time either.
Thus in Genesis 1:26 when God said, "Let us make man in our image", God was speaking this through Adam's descendants and through time unto Jesus and therefore it is not proof that God was speaking to another person of his being as though he were a trinity and which is never taught in the Bible anyhow.
I personally believe that God is omnipresent in all created time and space and therefore he was at the end simultaneous with the beginning and this is one of the reasons why he proclaims the end from the beginning also.
You could say therefore, that our finite existence and experience in creation is far behind that of God's and therefore what is only beginning to happen for us, is as though it already happened in the dimension of God's eternal infinite existence and experience and there are hints of this in the Bible also.