Welcome to SR, freethefish! It's good to have you with us. I'm not totally clear why you're wanting to leave AA and/or make a break with your sponsor. I'm a secular, non-AA guy but if it works for you why change? Understand, I'm not criticizing just curious of the reasoning.
I don't think relapse is inevitable nor do I think recovery is a process that lasts your whole life. In my case I consider myself a former drinker. I know that if I ever drink again things will soon be as bad as ever, maybe worse. But that doesn't mean I'm "recovering". I'll stay recovered as long as I don't drink.
Have you looked in to AVRT? That's worked well for me and a lot of other secular folks.
Again, I'm glad you found us!