Your wife will obey you on not studying the WTS teachings in the home but that doesn't mean she won't take them to the park and study with them sitting on a bench, or some witness kids' family inviting them round to 'play' or for a "Feast at a Barbeque".
She will obey only the letter of any agreement you make not the spirit.
She will employ "theocratic strategy" (others call it lying) and give you partial or incomplete information, and let you draw your own (Hopefully false) conclusion - after all no one forced you to understand what she said the way YOU decided to!
As she becomes even more indoctrinated she will tell you false information as you are a "wordling" and not entitled to be told the truth of what she is up to.(SEE Insight on the Scriptures under lying, and the WT on "Theocratic War Strategy")
Should a separation and custody battle ensue, the WTS has published a booklet used for priming kids to give answers in court or to social workers that makes the WTS sound just like any other mainstream church.
I wish you luck, but they are very cunning, and control peoples minds so well they even deny it. Tread carefully.
HB