Hi Brother David. Here is the same Isa 43:11 that you quoted in another translation: "I, even I, am Yahweh, and there is no other Savior but Me." Yahweh is our Savior! Yeshua, the Word of Yahweh, is One with Yahweh, and is the Great I AM Himself in the Flesh. Yeshua is our God and Savior and so is Yahweh.
If you read Revelation, the Angels sing Hallelujah. Hallelujah means, "All Glory be to Yahweh". That shows God can still be praised as Yahweh in the New Covenant. God said His Name Yahweh was for All Generations. There is thus no contradiction imho in Glorifying God as Yahweh, the Father, and Yeshua, the Son/Word, in the Unity of the Holy Spirit.
As we know, the Holy Trinity is YHWH, the Word of YHWH and the Spirit of YHWH. Psa 33:6 says "By the Word of Yahweh were the Heavens made, and all the Host (Angels) of them by the Breath (Spirit) of His Mouth (Word)". The Three Persons Who are One God are evident right from Genesis, for e.g. in Gen 18:1-3. Abraham sees Three Men but salutes Them as One Lord God, Yahweh. In the New Covenant, the Son was named Yeshua, because by His Incarnation, He had become our Savior. He is one with Father and Spirit.
The Patriarch Abraham, the Prophet Moses, King David, and other OT heroes and Saints of our Faith, referred to God as Yahweh, even while giving many prophecies of His Son Yeshua to come. We can continue to honor and worship both Father and Son imho.
When we read Holy Name Bibles, we see familiar verses in a New Light, which can be helpful to our Personal Devotion. For e.g.
"Yahweh is my Shepherd; I shall not want"
"Yahweh is my Light and my Salvation"
"Yahweh is my Rock and my Refuge"
"Bless Yahweh, O my Soul, and all within me bless His Holy Name".
When one calls on the Eternal Father by His Holy Name, one not only remembers His Great and Awesome Works through so many generations for Millenia, but also one experiences great Divine Intimacy with both Father and Son, and the Holy Spirit as well.
I like the KJV, it is a Great Translation on the whole. But I feel the Holy Name Bibles get it right on this particular point. God Bless.
The Jews have not called God by His Name for 2000 years. Has it brought them to Salvation in Christ? Nope. Maybe God is waiting for them to start calling Him by His Name Yahweh, with Deep Faith, Devotion and Love, in order to lift the veil from their eyes, and teach them the Truth that Yeshua is One with Yahweh? Yahweh is our Savior, and He will save Israel one day. Isa 43:11 has said so.
In Christ,
N. Xavier.