Chevy, I just can't picture how such a study would get started. Even without a WTS publication, the JW will take the JW approach to a bible study. I don't think it matters too much as to who picks the topic. [the following logic 'lifted' from Ray Franz] A dubbie thinks it makes perfect sense to tie 'Matthew Chapter this' to 'Daniel verse that' as though the scriptures were written in some cosmic form of a jigsaw puzzle. It is how they approach it. They tink that the word of God was set down for some priviledged few to interpret and mete out to the rest of us as they see fit.
I can say this, if I was to sit with a JW, I would let them cite a scripture. But then I would get ahold sf some readily available bible commentary and discuss the context. I would read the surrounding verses and the entire chapter. I would first make the dubbie defend their choice of the scripture, given its context. Then I would challenge them to make the connections they claim are there. They would fail, abysmally.
I don't think I've ever met a dubbie that could tell why a certain book was written, or what Paul's ideas of community were. Tehy look at the elephant from 4 inches away, and have no idea of what they see.
Good luck. Please keep us posted.