This is a tough one. You'll probably hear many menthods: the strong approach, the weak approach, the direct approach, the indirect approach. etc. What worked for one may not work for another, and vice versa. You need to know your wife and how important her extended family with the JWs really is. And If she is willing to sacrifice that for you.
This may not work for you but what sort of worked for me is the low, meek, under-the radar approach. Go inactive but don't go openly nor defiantly apostate. If you obviously turn apostate and get yourself disfellowshipped, you've just made your task ten times harder. So be inactive. Or irregular at the least.
Say that you are going through depression or other personal issue problems and allow yourself to loose your congregation privileges. This might be the hardest for you to do. It was for me because I enjoyed my congregation privilages. And the public shame that goes by their having to announce that I'm no longer a servant is a hard pill to swallow. But you'll get over that with time. In fact, if that depresses you further you can use it to further your case for depression. It will really be convincing if it was actually true. And being in a religiously semi-torn family should give you real basis for depression without you actually stating the nature of the condition.
They won't disfellowship you for being depressed or else they will have to disfellowship more than half of all JWs. But they will disfellowship you if you go against the WTS no matter what you got.
Start missing the meetings but also look for things that are of interest that you can do with your wife. If not on a Sunday then on a Saturday afternoon. Try to court your wife all over again. Not too fast, however. You'll have to be patient as it could take years. Start working by having her cut back on the time she spends in Field Service for starters.
When certain conversations come up just concentrate on what is the loving Christian way to do things looking for Biblical examples of them. Let her see how that is contrasted against how the WTS does matters. Winning her "without a word" is better then trying to argue or attack the WTS beliefs directly. Let her see how Bible examples of doing things contrasts against the WTS ways of doing things. Let her see for herself.
I'll turn over to others. May you find something that works best for you.