>>> the whole 1st chapter of the Hebrews completely excludes the possibility that the Son is an angel. 1:2 is a clear statement, absolutely fits to the Nicene Creed.
False. One may choose not to believe it, but Hebrews Ch 1 does not "completely exclude the possibility".
v2 - "But in THESE days (eschatou - or these last, final or latter days) he has spoken to us through his Son."
v3 - "he SAT DOWN (kathizo - to sit, be seated, sit down) at the right hand"
v4 - "Thus he BECAME (genomenos - having become) far greater than the angels..."
v5 - "You are my Son, and TODAY (semeron - this day, now) I have given you the honour that goes with that name."
v 13 - "SIT (kathou - to sit, be seated, sit down) at my right hand"
These are not continuous actions, thus indicating a situation where one originally WASN'T in one state or condition, but subsequently BECOMES or DOES those things. That is particularly relevant in verse 2 which explicitly says Jesus "became" far greater than angels - he at one time was not far greater in rank, but was later elevated to higher status by his Father.
The analogy between the two procreations fails in that while a human is the son of his parents according to the flesh, but a creature of God (because human procreation relies on God's creative power), the Son was begotten by the Father, and as such, does not require a separate act of creation.
Again, this is semantic nonsense. God created - He "begat" a son, a son originated from a direct act of His - therefore it was an act of creation.
To "begat" can mean "to bring into being by the process of procreation", but also more broadly "to bring about", "to cause to be" or "to bring forth". It does not only mean to produce in flesh by sexual reproduction. That is the same error of understanding that many Muslims make regarding Jesus being God's Son.
https://www.oxfordlearnersdictionaries.com/definition/american_english/beget
https://www.collinsdictionary.com/dictionary/english/beget
https://www.merriam-webster.com/dictionary/beget
In fact, for those who subscribe to the understanding that the Son assisted God in creating "all other things", then the Son was in fact the only "thing" created entirely by God alone, without him directing the Son as his "master worker". (hence the scriptural term "only-begotten", not simply "begotten").
However, the recognition that the Son was created by God does not require belief in the latter (that the Son assisted in all other creation). The two are not mutually exclusive. Although Hebrews 1:2 is explicit that "through the Son he created the universe", which again makes it clear that God directed and guided Jesus in the creative works.
Oh, and guess what else? Again, in all of those verses in Hebrews 1, no mention of a person called "Holy Spirit". It's all about the relationship between TWO persons. Why? Because the Spirit is not a person!