Chastity in vanilla life discussion

Let me give some background. My wife and I have been together for nearly eight years. In the beginning, I did things outside our relationship that I’m not proud of; I still feel guilty about them and am still paying the price (though that’s a separate story). Anyway, about two years ago, I admitted to her that I was interested in chastity and other related stuff. She agreed to give it a try. Naturally, like a kid in a candy store, I unloaded everything on her at once. This naturally led to her feeling overwhelmed and shutting things down. Along with telling me she wanted either this or nothing—a plain vanilla life otherwise. I chose her. However, things have never gone back to how they were before, nor probably will ever, leaving me longing for the state of being locked up under her control. The real catch is that since our botched experiment, her behavior has remained controlling and belittling, which was what triggered this desire in me.

So how can I broach the subject with her? How do I tell her I need to be physically under her lock and key? Any thoughts?