I disagree what you say here. I choose to keep the scriptures in context. Hebrews 1:9 reads, "God, your God, anointed you." This scripture makes it clear that the one addressed in verse eight is not God, but one who worships God and is anointed by him.
Also Hebrews 1:8, 9 is a quotation from Psalms 45:6, 7, which was originally addressed to a human king of Israel. I don't think the writer of Psalm 45:6,7 thought this human king was Almighty God YHWH.
Scholar B.F. Westcott said: "It is scarcely possible that Elohim(God) in the original can be addressed to the king....This on the whole it seems best to adopt in the first clause the rendering: God is Thy throne(or Thy throne is God), that is 'Thy kingdom is founded upon God."'
Therefore a number of translations of the Bible, render Hebrews 1:8 as, "God is your throne." (See An American Translation, Moffatt, in the marginal reading in American Standard Version, Revised Standard Version and The New English Bible). It's clear that the "Son," Jesus Christ, has a God who is higher than he is.
I quoted Hebrews 1:8-10 to specifically highlight verse 10 that the Son…laid the foundation of the earth, and the heavens are the work of Your hands.
This is a quote from Zechariah 12:1 —
The burden of the word of the LORD against Israel. Thus says the LORD, who stretches out the heavens, lays the foundation of the earth, and forms the spirit of man within him: Zechariah 12:1
We already know from 1 Peter 1:10-11 that it was the Spirit of Christ who spoke through the mouth of the prophets.
Of this salvation the prophets have inquired and searched carefully, who prophesied of the grace that would come to you, searching what, or what manner of time, the Spirit of Christ who was in them was indicating when He testified beforehand the sufferings of Christ and the glories that would follow. 1 Peter 1:10-11
Every time we see an Old Testament prophet speak saying thus says the LORD, it was the Spirit of Christ speaking.
To further amplify this truth we need only to look at more of the context of Zechariah 12 —
“And I will pour on the house of David and on the inhabitants of Jerusalem the Spirit of grace and supplication; then they will look on Me whom they pierced. Yes, they will mourn for Him as one mourns for his only son, and grieve for Him as one grieves for a firstborn.
Zechariah 12:10
Jesus Christ is LORD, YHWH the LORD God… to the glory of God the Father.
Jesus is returning with the saints on the last day —
Then you shall flee through My mountain valley,
For the mountain valley shall reach to Azal.
Yes, you shall flee
As you fled from the earthquake
In the days of Uzziah king of Judah.
Thus the LORD my God will come,
And all the saints with You.
Zechariah 14:5
JLB