Yeah that's a given. And you shouldn't try to separate her from family either. So it would be a tough balance if they want to ostracize you. If you're a strong man it could be possible to achieve both ends though.
Mormonism is a pretty top down structure, plus you have to pay 10% tithe to the cult. You're basically saying you should take over the religion and steer it in a new direction. Ambitious but unlikely.