" If “created” were the definitive meaning, we would expect all ancient translations to agree on this point, which they do not." - this is so untrue its not even funny (unlike some of your other comments, which are sometimes hilariously wrong) There are numerous other variations of scripture where if it were as cut and dry as you are trying to make out they would all match as well.. I can cite at least 10 off the top of my head, that if one word was the definitive meaning we would expect all variations to agree..
"David is called “firstborn” not because he was literally the firstborn son or the first king, but because he holds a position of preeminence among kings. " - yes he WAS temporally first in some sense (I am not specifying it so maybe you will be honest for a change and share it) and he still IS NOT an exception to the kings he is firstborn over.
David was THE FIRST to be "BEGOTTEN" by God (in the sense he was the first in his line to be chosen as a descendant of the messiah...) - There is one other interpretation as well which also requires temporal priority.
"However, the significance of the Creed cannot be ignored in this discussion." - I can ignore whatever the hell I want thank you - and I choose to ignore it - it is unbiblical and full of untruths.. so you can stop citing it to me - thank you. I will ignore whatever I want in this discussion - including you.
"Ephraim is called the “firstborn” over Manasseh in Jeremiah 31:9, though Manasseh was born first. " - there are 2 possible explanations to this... both have a temporal meaning, and it still doesn't negate the one called firstborn "coming into existence" OR being part of the respective group. This example is useless to your agenda.
"This is why Israel, as a nation, is called God’s “firstborn” in Exodus 4:22, despite not being the first nation." - but Israel was still temporally first in the sense, it was the first nation "adopted" by God... and separated from the other nations in this regard. This example is also useless to your agenda
a better one for you would be "the firstborn of death" - but that is even a stretch because it is still part of its respective group.
"However, these sources, while helpful, do not prove that qanah definitively means “create” in Proverbs 8:22." - Why does one of them literally cite proverbs 8:22 for such a meaning?
you also said "It never definitively means "create" in any of its 85 uses in the Old Testament. " - this is a bold faced lie as it does definitively mean "create" in at least 2 instances - Deuteronomy 32:6 & Psalm 139:13 - proven further by the LXX
Deut 32:6 can ONLY mean "create" because of what its in apposition to it
Gen 4:1 "create" is a possible rendering as "possesion" and "creation" are very closely linked in Hebrew thought.