I find it amusing that your strong argument in favour of the JW religion is one you admit they don't seem to have ever used, perhaps the GB should hire you?
More seriously I appreciate the response and the work you have put into researching this, I am bothered that some posters want to snipe about 'postmodernism' rather than engage on the actual arguments.
I am not opposed to the idea that there may be evidence that early Christians used some form of the divine name, though I find the idea that they could find evidence to support all 237 translations in their NT quite unbelievable, Romans 10:13 being the most obviously incorrect usage. (I can expand on this if you like, but suspect you are already aware of it) This is another reason why I don't think I could ever find JW doctrine 'strong' on this point. If evidence does emerge to support all 237 renderings I will be running back to the meetings!