Removal of your primary sex organs could be pretty detrimental to the relationship. I mean, that's a very big step. You'd likely have to get more approval and understanding from her prior to it.
Remember, she married you as a straight woman and she's known and had children with you thinking of you as her man. This will not be easy on or for her and likely, sorry to say, might end in your separation. You have to be prepared for how she'll feel and you have to understand it. Think about what's more important to you. And I suggest you handle this nice and easy. Don't push it too hard.