As to your question as to how you'd know if she's done with OM AND ready to recommit to the M...just plan on that never, ever happening. If it does be pleasantly surprised and trust that she'd let you know.
I'd also recommend you assume that nothing you do will change her in any way. Locking the masterbedroom door will set up a conflict. If you're doing this to demonstrate strength to her it won't work. If you're doing it to demonstrate strength to yourself it might...unless you back down.
I think the more you realize she isn't going to change and the less you care about her reactions the closer to the right path you'll be on.
Maybe ask yourself...if you knew another man that was going through this...how would you think he should handle it? Move out? Stay in the same house but just cut off all non-essential contact and build his new life by himself? File D? Take an extended vacation and leave the country for 6 months?
All valid ideas. Kick them around and think about what you believe you are supposed to do.
Me:38 XW:38 T:11 years M:8 years Kids: S14, D11, D7 BD/Move out day: 6/17/14, D final Dec 15