Manda63, Welcome to the forum. I'm sorry to hear another marriage is under tremendous strain because of the WT. I was in your wive's shoes-- raised in from age 9. My husband was a raised in from age 5. He faded 30 years before I walked away. I am not saying this to discourage you, just to let you know that there is always hope. I was an all-in JW for 42 years of my life. My husband and I had a similar agreement. I kept my "publications" to myself, and he kept his "spiritistic", spooky stuff for a JW at his office.
As everyone has said, continue loving your wife. No matter how many times the elders gave me the "absolute spiritual endangerment" get out of jail free card, it always came down to loving my husband and sticking with him-- not always an easy thing for either of us, but we made it work.
I, too, had a very difficult time witnessing to wives at the door. I mentioned it to an elder, saying I didn't want to put anyone through the same pain I had living in a "divided household." His answer, "At least she would have Jehovah.", as he walked away. I didn't buy the "overlapping generation" crap of 2010, but I was still stuck in the cult. It took another year. It just hit me like a ton of bricks. I could't stant to hear them say my kids were going to die one more time. I walked out of that meeting in mid-May confused, somehow knowing I wasn't going to be a JW anymore. Two weeks later another glimmer of hope happened on a sailboat charter vacation, away from meetings, Bible study, service, etc., I had the thought, "I wonder what my life would be like if I could just live in a tee shirt and shorts, no shoes, no dresses, no meetings, no books, no nothing-- just the wind in my face?" It happened so fast, but I remember it 'til this day. I didn't go to another meeting until the District Convention July 1-3. I was an outsider looking in. It felt like the Stepford wifes. I was done.
Get your wife away from the meetings as much as possible. Do fun things together. Try new things. Tell her you love her, and show her. Don't give up. Use Steven Hasaan's methods. They can work over time. You have a great advantage in having this forum and others. My hubby didn't have the Internet. Maybe if he had, I would have gotten out sooner. It doesn't matter now, because our nuclear family is out and free. My 86 year old in-laws are still in, but have no idea I left. It's easy to fog them as they live 500 miles away They shun my husband and my kids. Our Kids are grown, so there is really little need to visit.
I wish you all the best in keeping your marriage happy and stron and getting your wife out of this very dangerous, mind control cult.