My suggestion only, so feel free to ignore it.
Court your wife with a vengeance. Support her in all her JW activities and make her the happiest wife in your area. Then! Bite the bullet and explain to her your true feelings on the WTBTS, when the time is right. At first she may insist that she wants to continue in dub land - continue to completely support her.....then .... see if her thinking processes don't suddenly start working.
Your kids deserve to be rescued from the cult....and your wife. But you have to be cleverer than the WTBTS to do it.
These tactics certainly worked for my husband. It took about a year... and then I also started to fade....at the time still believing that we were now all 'doomed'.
But...the longer you stay in the bOrg, the more affected your children will be. I certainly see the difference in the attitudes of my older children (early twenties) and my younger ones, (thirteen and 6).
I hope it works for you.