this group of Christians to champion his name
In the whole hebrew spricptures the name stands for a person. So it doesn't turn about "to champion the pronuncation of the name" but about to champion Gods person. "Let your name be santified" could be spoken then also "You shall be sanctified."
It is the beginning of Jesus prayer, in which besides the kingdom, the will and on the first place the person of god should be the supreme value in the life of a christian.
So it is not by the usage or pronuncation of the tetragram that one can follow Christ but by giving the person of god the supreme place and thus honouring him.
The hebrew Tetragram YHWH itself cannot be the item of santification today because of another reason. The correct pronunciation of the tetragram in hebrew got lost and further it was not used at all in the New testamtent even in citations of the old testament.
"God's name is holy in itself; But we ask in this Praise that He will also be holy with us " ....in what we say and by what we do. Marin Luther
The treasure of usage of the name of God in the hebrew bible is that the name indicated God's presence (not to mix up with the invisible presence of Jesus since 1914) meaning that his "being here" or presence how it was experienced by men.
We ask God to sanctify His name. With this we ask for his presence, which his name promises. Through the book Ezechiel now we know what it means when God sanctifies his name. There we read that he will gather his people, clean it, and gives it a new heart and a new spirit. This all we ask for when praying "Let your name be santified."
‘I will certainly sanctify my great name which was profaned among the nations, which you profaned among them; and the nations will have to know that I am Jehovah, declares the Sovereign Lord Jehovah, ‘when I am sanctified among you before their eyes. .. I will give you a new heart and put a new spirit inside you. I will remove the heart of stone from your body and give you a heart of flesh.
Ezechiel 36,23 + 26 NW
Again in the text you see that santification doesnt turn around the knowledge of pronuncation but turn around receiving a good spirit, a "spiritual discipline". Praying "Let your name be santified" means living so as one would hope for the presence of god.
"So even we (the people of god) can become a place in the world where the glory of God is visible for all."
from a text of Mag. Liss working at Institute of bible science and catolic privat university Linz in "Let your name be santified" https://www.dioezese-linz.at/dl/nMpuJKJLLLkNJqx4KKJK/135_Geheiligt_werde_dein_Name.pdf