Has anyone seen a case of this being successful when OP is not removed completely? MDU's sitch is the only one I see remotely 'similar', although that's more out of necessity (work).
No, I haven't. And I would contend that mdu's sitch is NOT working, because:
a) mdu herself remains extremely anxious about the daily contact (it doesn't work for her) -- she does not feel safe in the relationship. And
b) After 7 months, her husband still professes to having feelings for OW. Had full no-contact happened, "hard withdrawal" would have taken only a couple of weeks, and his feelings for OW most likely would have been gone by now, in my experience.
It's a chemical/physiological thing, Tar. As Yogi said, "You can look it up." Continued contact (even NEGATIVE contact, btw) resets the wayward's withdrawal "clock" to 0:00:00 upon each contact.