I already have IC lined up for her(a couple of recommended counselors she could interview).
You wrote this. Omg, just no. Sorry, not being harsh, but I am worried. You do not get it yet. You are not even 1/3 as detached as you think you are. She just "noticed" the detachment and you think she is ready to change? Oh, no. You are not on the right track.
1. Stop thinking of her--think of you and your very own life, interests, time, hobbies, friends, family.
2. Stop allowing heavy conversations or caring if she cares that you don't care! Because that means you are too focused on HER. Talk about Stranger Things. Or Christmas presents for your kids. Or whether to bake or deep fry the turkey. That's enough.
3. Do not be mean, cruel, cold or intentionally hurtful. Simply be meh. Where are you at this time in your life? Find you and care about you. Caring about you is NOT trying to hurt her. They are unrelated.
4. Think of this as your new life. There is no time period for focusing on you; it's forever. If you want her to invest in the M more, maybe you should make a little room by investing in the M less?
5. Enjoy your kids in new ways when they are home. That will be fun for you. New hobby? New sport?
6. Why would you give her a plan for R? Directions for getting through to you? If SHE is not happy with the new self-focused you, SHE will get creative in winning you back! PUT THE WORK ON HER. (And never EVER line up counseling for someone else. That is the epitome of codependency. If she is organized enough to cheat, she is organized enough to fix it by finding IC.)
7. File after the holidays? Who knows! See how the new you feels in his new marriage with his new lesser valued spouse! Decide then.
8. Please put effort into enjoying the only 2017 holiday season any of us will get instead of fixing someone who seems to be okay being broken. Her choice! Not your problem. Get busy living your life.
9. If she wants to R badly, you will KNOW it! And you will instinctually know what to do.
10. Enjoy your newfound independence and power.
P.S. Please get IC. You need it.