jwfacts I appreciate you believe the evidence is not strong enough. JWs and a number of non-JW scholars feel otherwise
A number of scholars do, a number don't. I prefer the don't position, but if more solid evidence came to light I would have no problem updating my position. Either way, it would have zero relevance to what I think about Watchtower teachings.
JWs ... feel otherwise
99.9% of JWs don't feel otherwise, because they don't have an opinion. As a JW, I had no idea that Watchtower had added the word Jehovah to the NT, and I have never known any other JWs that were aware of this either. They assume it appears in the discovered NT manuscripts, in the same way that it appears in the OT manuscripts.
JWs are not evidence based, they are faith based, and that faith rests solely in what the GB state. That is why I would like to know why you think this topic is important. Evidence of the divine name in the NT is no more important than evidence of Jerusalem's fall in 607. JWs believe it regardless of any evidence.