Should I start putting thoughts together about how we could move our MR forward? Or is this just way too soon?
Too soon. You've got to see solid indications from your W that she is interested in recon first. She's still two feet out the door though.
Question for you, how important is this job offer to you? If it's something you really want, you might pitch the idea to her of W moving there as well, but separately from you. I realize there are financial implications but if you really want/need this new job then it's a way to make that happen without putting R pressure on her. She wants a "fresh start" anyway, so maybe pitch it to her as a way for you to have this new job and her to get a fresh start while maintaining the convenience of joint custody of the kids. It just seems like she hates the idea of moving somewhere else with you when what she really wants is out, but at the same time you don't want to get stuck not being able to relocate because of her.