Dear outsmartthesystem,
I too am not a passive personality and can relate to your need to take a stand especially since challenged to do so! However it may be wise to do so on your terms and convenience instead of your wife's and the WBTS'.
It may be wise to carefully develop a strategy and patiently stick to it no matter how hard - you are at war for the freedom of your family...
As scripture says, there is wisdom in a multitude of counsellors...
If God himself is one of these counsellors so much the better...
Personally I disagree with the strategy of proving the WBTS wrong, especially in this case.
Why not rather prove them right, using their own publications?
I do agree with asking questions.
"What is the gospel in one word?"
"What is the gospel in one sentence?"
"What is the gospel in one paragraph?"
The hidden point is that the unabridged gospel message actually exists in the Watchtower library - albeit badly fragmented. It was also specifically designed by God himself to set spiritual captives free.
The gospel is the right tool for the job - and the most powerful too.
607 is the wrong tool for the job.
Your wife has never called herself an expert on 607!
But she has called herself an expert on the gospel!!!!!!!!! She does this every time she door knocks!!!!!
The gospel and the "good news" are one and the same.
Your wife calls herself a "publisher of the good news", an evangeliser. Yet she is ignorant of the good news (or evangel, or sacred secret) according to Paul. This is a serious problem and opportunity - more than half the Bible's roughly 152 references to the "good news" are by Paul!!!!!!
In this way you can also put the squeeze on the WBTS. There is nothing they SECRETLY hate and fear more than the unabridged gospel message!! The evil spirit in them knows instinctively where the gospel leads... Yet they cannot attack it (directly) for fear of exposing themselves for what they really are.
May you be granted the power and peace to be loving, patient, gentle, wise and kind...