All I can put out there is what you've done isn't working. If you cannot DR, then you can't. But boy, if I were in your shoes I'd be giving it a heck of a try. It's one thing if there's difficulty between 2 spouses, but when an OP gets involved, things change dramatically. Either way, I wish to God I had found MWD 6-8 months ago. I looked, but I found the wrong sources. The ones that made sense. I can tell you - it didn't work.
I think the "as if" will get much easier once she moves out, which is imminent now.
Me-LBH, 48 Spouse-WW, 48 Married for 19 years Son, 12 BD #1 - November 1998 (EA 7 months after wedding) BD #2 - November 2015 (same XBF EA) WW filed D February 2016 WW moved out April 2016