Gunny Didn't realize there was an OM involved, and that she was moving to pursue OM. That changes everything. I wouldn't recommend dragging your feet because now it just makes you look pathetic. If no OM was involved you would look like a good husband who loves his wife and is willing to give her space.
When there is an OM involved you just look like you can't accept what is clear to her, she has found what could be a better man.
Remain amicable, but don't stall keep up her space in the divorce, let her know she will lose you.
As for OM it's as good as done, she is his not yours anymore. The only way you will get her back is when all the fantasy goes away when and if OM turns into a dud, and then turns around and sees how smoothly paved the way back home is. Sorry to be a downer but she is in a hurry because she saw OM and things went well. I think you should follow her speed, if she speeds up move along with her.
You may love her, but it is not your job to provide for someone who clearly (at least for the time being) never intends to recirprocate.
Distance to discover herself fine, help all you can. Her pursuing someone else you should not endorse or sponsor that.
Do not enable her, let OM do that if he is so wonderful.