And yet God has said that no one is, nor will be beside Him in the future; no one else, let alone any "God" formed, because there is no other God, will share in His glory of what He will do unless His name should be polluted. Here is your reference again.
Isa 43:10 Ye are my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that
I am he:
before me there was no God formed, neither shall there be after me.
Isa 43:11 I, even I, am the LORD; and
beside me there is no saviour.
John 8:23 And he said unto them, Ye are from beneath; I am from above: ye are of this world; I am not of this world. 24 I said therefore unto you, that ye shall die in your sins: for if ye believe not that
I am he, ye shall die in your sins.
So don't let "appointed" limit what other scripture is plainly declaring that Jesus is God of the Triune God as that is the Word of God that has been speaking to you even in the scripture of the O.T.
Zechariah 12:8 In that day shall the Lord defend the inhabitants of Jerusalem; and he that is feeble among them at that day shall be as David; and the house of David shall be as God, as the angel of the Lord before them.
9 And it shall come to pass in that day, that I will seek to destroy all the nations that come against Jerusalem. 10 And I will pour upon the house of David, and upon the inhabitants of Jerusalem, the spirit of grace and of supplications: and
they shall look upon me whom they have pierced, and they shall mourn for him, as one mourneth for his only son, and shall be in bitterness for him, as one that is in bitterness for his firstborn.
Revelation 1:17 And when I saw him, I fell at his feet as dead. And he laid his right hand upon me, saying unto me, Fear not;
I am the first and the last: 18 I am he that liveth, and was dead; and, behold, I am alive for evermore, Amen; and have the keys of hell and of death.
Jesus cannot say those things in the O.T. & the N.T. unless He was and is God and always has been of the Triune God.