It sounds like a good way to begin. I'm sorry thought that you're going through this. As for your kids, definitely make sure they have other friends. This will be one of the most important things that you can do. (BTW, I also listened to Kingdom Melodies when I was a kid. Mostly because those were the only records I had and I wanted to use my new record player but I did like them) Are your kids interested in sports or playing an instrument? If they are I'd suggest they try out for something, anything! Or get involved with community theatre, etc. That way they are having positive influences in their social lives. Just a suggestion.
With all the studying and prep work you've done I think you'll have success in irritating the heck out of the elders, just no matter what try to handle it with love and try not to attack them too much. Lay out the facts but keep emotions in check if possible. Otherwise you'll spook them!
I hope it all goes smoothly and that your wife and kids do decide to leave the org.