Colin, might I make a suggestion? That is to make sure in your own mind (and your partner's) what your beliefs are before you involve your children? Could save them a whole lot of hurt and confusion. You sound like a smart man and I'm sure you've already considered that, just saying ...
Not my business, but happy to hear you've discontinued the study and the meetings. And the Bible book for kids disturbed me as an adult. I never did send it to my grandchildren (parents not JW's) - so glad I didn't!