I'm a big believer in "fortune favors the bold". You're thinking about leaving if there's no improvement anyway, so you really have nothing to lose by trying to escalate the R. I say go for it!
Sitting still is the most difficult thing for me. I know it is important at times. I just wonder if this change in her state deserves a response. Your right, I have nothing to lose.
I have also considered a serious R that is non-threatening but reiterates in a calm tone that I plan to move on if she still doesn't want to work things out and how that might look in a methodic and respectful way.
I know to bring up MR is not in the manual.
W has shown a change, I'm ready to break out of Limbo Land.
M 53 W 54, M since 98 D15, D19 8/2013 discovered EA, W maintained contact with OM until 10/14 7/2/17 W said she wanted S, 7/25/17 moved out of MBR 12/17 W says moving out 5/18, W still in home.
