JBNATI, All of the advice I get outside of DB is to take a hardline position to get a lawyer and proceed to a legal separation or divorce. What I understand of the DB approach is to not proceed with lawyers because they are meant for getting a divorce.
You wouldn't be here if you wanted a D. I think the way to accelerate the process of a D would be to file yourself. I think you're very clear that's not what you want.
That all being said, it would be wise to at least speak to a L and be prepared. They can at least advise you on any risk you are taking. You don't have to let them talk you into anything you don't want to do.