This is what my husband did.
He never opposed to me directly but he made it clear that he did not want the kids to suffer the trauma of being "different" in school, I can take them to meetings only if they were not forced to go, He would cook for them (or go out ) on Saturday mornings so kids always look forward to that day and I will go to field service by myself. He would plan to go out every other weekend.
Also tell your wife that the one who is dedicated is the adult not the kids, so if they haven't made that choice we shouldn't do it for them.
Enroll them in sports. That will keep them busy.
Assure her that if the elders question her about the kids activities she wont be in trouble because you are the head of the house and you are the ultimate responsible. And if the elders want to know anything send them to talk to you.
By the way, my kids are 18 and 16, never baptized
They stop attending to the meetings about 3 years ago / they were never publishers
And thinking back, I guess, deep inside of me I wanted the same for my kids because I never opposed to anything and I always supported them on their academic and sport activities.