It's a pretty heady topic, that I do enjoy discussing. It's much easier to disagree with Trinitarians on the subject than with you, quite honestly.
They make the leap to the Jesus is Yahweh conclusion quite quickly when asked to examine NT references that quote OT passages where it is undeniable that the writers are both pointing to Jesus as the coming of God (Yahweh) himself. That's a core belief for trinitarians.
I like and respect your perspective and appeal to "agency" --and actually agree with you on this point. While I'm not aware of anywhere in scripture that you will read the expression "Yahweh Shaliah" what I see instead, and repeatedly is the concept of what some call the angel of the Lord--
In the Hebrew Scriptures this concept is demonstrated in various ways. The Hebrew word used to signify such an agent is
malak. This word is often translated in our English Bibles as
angel, a misleading translation. Our English word
angel is a direct transliteration of the Greek word
angelos, which means
messenger, envoy. The translators then use the word
angel to translate
malak, which also means
messenger. Both words
malak and
angelos are used of both supernatural beings and humans.
And this is how I see the man Jesus--- an agent.
View: https://youtu.be/RBHcWvqXUQI?si=VCnDeRsee38MjNZL