I can only tell you my experience: my WH continued to work with his AP for two and a half years past dday.
WH could not easily get another job (although not impossible) without losing some income, I then lost my job, it felt that it was getting for bad to worse for me on all fronts and keeping his stable job was a sensible option.
WH had absolutely no reason to interact with AP. They previously met on a project that, once the affair came to light, WH handed over to someone else and their reason for any work interaction ended there and then. Big company with 500 employees in the same building (thousands nationwide).
WH also told his line manager about the affair and his line manager ensured they never attended a meeting together again, he told her line manager they cannot work together again, it only happened once that my WH joined a virtual meeting she also attended (although she wasn’t on the invite) and he dialled off immediately and informed his manager who ensured it will not ever happen again. HR was also informed.
WH spent all that time reporting any sightings or potential interaction (such as when he dialled on the meeting mentioned above and he saw her name as a participant and dialled off), any time he went to the office canteen he would call me and stay on the line. If he bumped into her by any chance, going to grab a drink or going to a meeting he’d call me and tell me about it, or when he joined a couple of all employees events and saw her staring at him he’d text me at the same time. That was our agreement in order to cope.
She used to come on his floor on purpose and pretend she is talking to someone (he’d call me and tell me about it). She also posted all the stuff possible on FB including affair details and I felt I couldn’t back away from checking it as she was still working with him and I needed to see what she’s up to. She also reported herself any sightings by making comments such as how my WH looks covered in guilt and it eats at him. She had threatening behaviours at points which again made me feel unsafe if I didn’t keep an eye on her SM (which we later reported to the police when she got specific enough and I felt really unsafe). She used to check his outlook diary and make up stuff based on it until he realised and made his diary private.
Anyway this was the dynamic with a WH who willingly reported every move that had anything to do with her and wanted her out of his life.
IT WAS HELL!
I work too and each minute of the day I couldn’t concentrate. I wondered if that specific moment in time was the moment they were having coffee behind my back laughing at my stupidity. Despite all my WH’s reassuring actions my trauma response was so raw, I used to have panic attacks at the thought of them casually saying hello in the hallway. I had absolutely no opportunity to shut the door on her and start healing as she also lives in our area so I had to look over my shoulder if I went to the shopping centre so it was a constant feeling of being under attack, during office hours I still felt she "had" my husband (this was an office hours affair) even if he was constantly accountable and reassuring, at the weekend I constantly looked over my shoulder in case she was anywhere I went.
No doubt some things got magnified in my head as I perceived her as an intruder from the beginning so I am not exaggerating when I say I felt I was always exposed and I was waiting for the next kick in the gut.
Besides this, when I had a good(ish) day and managed to focus on healing, suddenly WH would call to say there has been a sighting or that she’s done something. Or she’d post something she found in WH’s diary and push me over the edge (she once pretended she was with him at a health assessment which he had in his diary, he didn’t attend the appointment but she didn’t know that. That was about two years post dday, yes she was that crazy).
So my advice: change jobs if feasible. Think what’s more important, your mental health or your husband’s job. On the plus the ow in your story may not be so focused on you and wanting to cause misery however on the down side you have a WH on your hands that doesn’t even understand the importance of no contact (mine didn’t either for a while until she turned on him and then he wished her dead) so if he believes he can still say hello and be friendly then I can’t see how you’ll succeed at R, frankly I’d wonder every time we argue if that’s the day ow will be extra sweet and WH extra angry to engage in the affair again.
The ow in my case was made redundant at the beginning of the pandemic. She upped her game big time pre departure including getting a job in a team my WH worked with directly and the manager of that team had no clue about the A, she turned up at work one day sitting two desks away from him and posted on FB about how she "won". That didn’t last long (long story, WH ended up working from home and her moved to a different part of the building, the trial ended and they decided the role wasn’t suitable), thank God she left. I can tell you that I did not understand the importance of cutting all ties completely including changing jobs until that day. Regardless if the WH is on board with NC or not changing jobs enables healing faster in my view. I’ve lost 2 and a half year focusing on this woman, on WH’s sightings of her, of my heart racing when meeting WH for lunch as part of our reconstruction work (yup she checked his diary and decided to show up and make her presence known a number of times), instead of focusing on my own healing more.
For your sake I would say ask him to change jobs.