This idea could work but you'll have to plan well. What I mean is the first time an elder came over to speak with me on the subject of who really are Christians the 144k or all of us, my wife was present. He then made a statement that made it seem that I was wrong because I hand not covered that specific point he made in my paperwork. This statement was easily refuted at the next meeting but by then the wife had heard enough at the first meeting to reinforce her beliefs and was no longer present at any of the other meetings. In fact I think they instructed her to remove herself and the kids while we spoke. So you must have all your information ready and be prepared for any thing they may say. It would also be important that she was there and you kept emotion out of it.
Remember one slip up on your part is all it will take to reinforce her beliefs and you'll get no second chances.