Either I wasn't clear (highly possible :)) or you misunderstood. What I said about YHWH is that He would be whatever Israel needed Him to be in order to get them out of Egypt and into the Promised Land. This is in direct contrast with all the other Ancient Near East Gods who had set functions and roles within the spiritual world. The sun god made the sun rise and set, and that was all he did, the storm god caused storms and that's all he did, etc, etc. YHWY was simply telling them that they only needed one God. The Hebrew imperfect verb can absolutely be understood in this way.
YHWH giving Moses commands at the burning bush (an in-progress event for Exodus 3:14) about delivering Israel from bondage in Egypt then providing the Promised Land to the Israelites, all this is currently present for the perspective of the dialog participants; in other words, "I AM Who I AM" (Exodus 3:14) are the words YHWH commanded Moses to pronounce while standing in front of Israel - in the present tense!
Israel may change, for example, from Egypt to Canaan, bur God does not change (Malachi 3:6).
The Word of God says "I, YHWH, do not change" (Malachi 3:6), so "I AM" is accurate and true for Exodus 3:14.
You, on the other hand, wickedly coney that God changes with your "I will be" for Exodus 3:14.
YOU DID IT AGAIN - YOU MISSPELLED YHWH GOD'S HOLY NAME! YOUR REPEATED DISREGARD FOR GOD'S NAME DEMONSTRATES JUST HOW LITTLE GOD MATTERS TO YOU!
Forgetting for the moment that you added, "such that Jesus declares Himself to be YHWY God" to the text, we'll go ahead and say that this verse proves Jesus is God. OK. If that's the case, there are many things that need an explanation:
Who is God's God? (John 20:17, Rom 15:6, 2 Cor 1:3, et. al.)
Jesus is a man (Rom 5:15, Acts 2:22, Acts 17:31, et. al.) but God is NOT a man (Hos 11:9, Num 23:19)
Jesus increased in favor with God (Luk 2:52). YHWH increased in favor with Himself.
Jesus had a distinctly different will than YHWH (Luk 22:42, John 5:30, et. al.) God wasn't sure what He wanted.
One part of God is the head of another part (1 Cor 11:3) !
One part of God is greater than anther (John 14:28)
One part of God had a doctrine different than another part (John 7:16)
One part of God knew something another part didn't know (Matt 24:36)
One part of God had to show another part about the future (Rev 1:1)
God was made lower than the angels (Heb 2:9)
Jesus is called the Son of God about 35 times, whereas he is never called God the Son
John 17:3,
And this is life eternal, that they might know thee (his Father) the only true God, and Jesus Christ, whom thou hast sent.
Was Jesus talking to himself here?
1 Cor 8:6,
But to us [there is but] one God, the Father, of whom [are] all things, and we in him; and one Lord Jesus Christ, by whom [are] all things, and we by him.
All of these verses are simple, straight forward statements. They say what they mean and mean what they say.
In contrast, there are no such clear cut declarations that God is 3 essences in one person. Of course there is no verse that says God is a "trinity," let alone the requirement that one must believe the trinity in order to be saved. We don't have to use phrases such as, "the person of the father" or the "person of the son" etc. In short, there are no verses whatsoever that clearly state in no uncertain terms anything at all said by the trinity doctrine.
Jesus Christ is truly Man (Luke 1:26-33) - the Son of Man, and Jesus Christ is truly God (Luke 1:34-35, John 8:58, John 20:28, John 5:18, John 10:30-31) - the Son of God.
Based on this Truth (John 14:6), Jesus Christ can refer to Himself as Man at his discretion and when He deems it is appropriate.
Furthermore. Jesus Christ can refer to Himself as God at his discretion and when He deems it is appropriate.
Here is an instance of Jesus, truly God, saying "I and the Father are One" (John 10:30) in which Jesus speaks in His capacity of God thus including both the person of Jesus and the person of the Father in the One True God.
Here is another instance, this time of Jesus, truly Man, saying "Stop clinging to Me, for I have not yet ascended to the Father; but go to My brethren and say to them, 'I ascend to My Father and your Father, and My God and your God.'" (John 20:17) in which Jesus speaks in His capacity of Man thus including the person of Jesus and His brothers in one (John 17:21). See, the Son of Man being the firstborn of the born of God persons (Romans 8:29, Colossians 1:15, John 3:3-8).
We, children of God, can also refer to Jesus in his capacity as truly God as well as His capacity as truly Man. We can use context to make the distinction.
We, born of the Holy Spirit of God persons (John 3:3-8), are one in God (John 17:21) because of the indwelling Holy Spirit (John 14:16-17), thus God is One. We are the blessed beneficiaries of the Holy Spirit of God's work in us.
The Truth (John 14:6) is that Jesus is God for the ever living Jesus proclaims this Truth "Truly, truly, I say to you, before Abraham was born, I AM" (John 8:58), so according to the Christ, Lord Jesus existed in eternity past which means He is uncreated thus He proclaims that He is YHWH God for there is NO other that exists in eternity past (Isaiah 45:5).
All of these verses are perfectly true, but you reject Jesus and you do not receive His sayings, so hear Jesus "He who rejects Me and does not receive My sayings, has one who judges him; the word I spoke is what will judge him at the last day" (John 12:48).
Immanuel (Matthew 1:23 "God with us"), Jesus, is truly Almighty God, YHWH, with us (Revelation 1:8).