I did refer to the Greek of the word "form" (morphe) in the NT and Septuagint. I figured you had already looked this up and were going to be honest and agree that it is used consistently to refer to the outward appearances in Scripture. Compare Philippians 2:6 to Mark 16:12 with the Septuagint's Job 4:15-16, Isaiah 44:13, and Daniel 3:19. It doesn't refer to the nature of God anywhere.
So your "Who, being in very nature God" version doesn't translate to English as such. Furthermore, even if it did, you still wouldn't have an argument because Christians are to have the nature of God themselves, according to Peter.
2 Peter 1
4Through these He has given us His precious and magnificent promises, so that through them
you may become partakers of the divine nature, now that you have escaped the corruption in the world caused by evil desires.
I also have already been discussing this same thing in a different thread it came up. So I may have to repeat some other points I have already made in another thread, but Jesus is also not equal to God and denied it in John 10 & 14.
John 14
28You heard Me say, ‘I am going away, and I am coming back to you.’ If you loved Me, you would rejoice that I am going to the Father, because
the Father is greater than I.
John 10
29My Father who has given them to Me is greater than all. No one can snatch them out of My Father’s hand.
So your premise doesn't have Biblical support for the deity of Jesus.