Sandi is pretty clear where she stands on this and she knows her stuff.
I see it as ultimate cake eating. She either comes back for the whole package or she doesn't. hShe should not be allowed dictate the terms of her coming back.
As a minimum she needs to commit to nc with OM, full transparency andto work on M. I would insist on MB, but don't expect intimacy. If she agrees ye have a chance. If she doesn't you know you were right to avoid in house separation by letting her back.
Next on your list could be separating your finances.
Good luck.
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together