I am sorry about your sitch, Jason! I hope that things work out for you.
If you are to follow the DB techniques, then you need to work on yourself, and realise that you can only control yourself, and not your W. IMO, it would be a mistake to ask her to wear the ring. In her mind, the M is over, and the request may just give her another excuse as to why it is.
Did your W not give you any reason why she wants a D? How long have you been M? Is she willing to go into counselling?
Now is the time to keep a cool head. Whatever you do - DO NOT beg her to stay, don't promise her anything, don't cry in front of her, don't argue or fight! Don't bring up R discussions - if she does, then just validate her feelings, not necessarily her reasoning, and try and keep calm. I know, very hard at a time like this.
Good luck!
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim