I think the argument about whether Jesus actually used/enunciated the name will continue. I think the JW Org reasoning on the closest pronunciation for YHWH being Jehovah in English, and of course Yehovah or similar in many other tongues that do not use the hard "J" is soundly based.
Of course one thing to remember is that Jesus actually spoke Aramaic, so in his actual usage of the Name (assuming he did) it would sound nothing like Yehowah or Yehovah.
So, we come back to the again sound argument of JW Org that in English Jehovah is recognized for what it is, the commonly known English rendition of YHWH.
The other argument as to whether the name was written in the Autograph copies will never be solved or concluded, unless an Autograph copy were found, as likely as me winning the Lottery methinks !
Again, I rather favour the idea that it probably was, it is certainly plainly there in the Qumran MS. so why would the Gospel writers and more importantly perhaps Paul ( the earliest Christian writer), shy away from writing it ?
Then we come back again to the old argument, when reading the Text, did the readers pronounce the name, or substitute something ?
By the time the Gospels were written the Christian outreach was to Gentiles, having failed to convert many Jews, so, again why not actually pronounce the Name ? Nobody would be offended, except a very strict Jew perhaps,who was now Christian, but their being offended could be dealt with no doubt.
I am rarely, if ever before ??, in the position of defending the JW Org position, but we have to take the scholarly consensus on all this.