You are following the right actions. Take one step at a time.
From other threads here, staying in the same job has not worked. Largely because the betrayed spouse can't deal with it. The work phone call is safe for affairs. That is true whether they work in the same company or different company. However, internal phone is not noticed so much as phone calls outside.
Work, in general, is a good safe zone for cheating. You can make believe you are going to work, then call in sick. Leave early, go in late. That is always there, working in same company or different, just that being in the same company is a little bit easier. The higher you up the food chain, the more independence you have in the company, the less it matters because no one is watching over you expecting you to be at your desk.
That is something to look at down the line. That is about step #23, you are at step #9. You have a long way to go, and sometimes these things work out themselves. Over time, you will get a better feeling for whether this will be OK or not. Don't be so sure it is OK. I suggest not to promise anything that you will not ask her to leave the job.
My wife wasn't in a co-worker affair. If she was, then I would ask her to leave the job. Long-distance company or otherwise. Because that is her consequence. There are music groups and songs that my wife got rid of because they were related to her affair. Anything related to the affair must go. That was my mindset. She had to quit the interest group that she met from other man. Walloped, I think, asked his wife to quit her charities. To me, if my wife wanted to stay involved in that activity, then she shouldn't have cheated there. Don't shit where you eat. Consequences matter, I think. I told my wife she could do whatever she wants, but so can I. That really always was true, we didn't need an affair to both do. But my wife had complete control to stay in the affair and sing the songs and all the rest, and I had complete control to leave the marriage if that's how it was.
Now these here below are all good things, needed things, BUT this is just the first step #9. There might be another 50 more steps. You did this quickly, most betrayed are in their own fog, so I have no doubt you will be OK no matter how this thing ends up. I also know that this list below is a list of what you have done, not what consequences have happened, but I want to focus on what consequences happened so far:
(1) put her out of the marital bedroom
- that is a very minor consequence, and temporary, but it is good if you want it.
(2) seen an attorney and can have divorce papers to hand to her in less time than it will take you to get to work
- that is not a consequence; it will be if you file; but it is good you have taken the steps.
(3) told my wife it was ending immediately
- that is not a consequence. Imagine me stealing a million bucks and my consequence would be, stop stealing from now on. Not even give the money back, just stop stealing from now on. But it is good that she agreed to end it. As you may remember, the one thing that gnaws at me and find disturbed is her initial reaction that basically, it's only sex, so it's ok.
(4) gotten access to everything she owns that is electronic
- that is not a consequence. She had secret communications that she never should have had. By the way, my wife never changed her passwords during her affair because she knew I would immediately think something wrong was going on. But it is good she now gives you access.
(5) told this forum that she does not interact with OM on company e mail daily or have any need to because they are in different zones on different parts of country
- with all due respect, how would you know if she was interacting with him or not? I neither believe or disbelieve that she is "no contact" with him right now, I cannot know. If she is in no contact now, for how long will that last? None of us can know our cheaters have stopped contacting except by their behavior and our hard-earned knowledge of her past cheating. To many of us, if not most, there were signs, but WE TRUSTED. We now longer and maybe will never trust that way again, so she can't cheat as easy next time. But we can't know for sure she is not in contact just because guy is across the continent and she says there is no contact.
(6) gotten a written timeline recommended by everyone
- this is a very important step, yet as far as how much of a consequence this is, I am ambivalent - basically she is telling the truth about the lying and hiding she's done. As far as consequences go, I am not knocked over by it. Combination with polygraph is a bit more of a consequence. It is not pleasant to have to go to an outside expert because her husband of many years no longer believes her. But very good she gave the timeline.
(7) talked to OM wife, which will be verified by a conversation tomorrow and a PI if necessary
- not a consequence on wife, but is on OM.
(8) scared the shit out of OM enough to have him confess to his wife.
- not a consequence, but good.
(9) will confirm tomorrow that he is at the meeting that she backed out of.
STD tests are a small consequence.
Giving up toxic friends would be a consequence, so would leaving the job.
Did she buy new lingerie for other man? Did she get cards and gifts from him to her and vice versa? I would say all lingerie/clothing for other man should go, that is my opinion.
Keeping gps, monitoring phones and logs and emails - those are so easy to get around, it almost is not worth the trouble. Maybe it is good when you are in the first month or two when it is raw, but it gets old real fast. I lasted two weeks monitoring. I couldn't look myself in the mirror. I have to check on my wife's messages so she doesn't fuck another man. I have to be her warden, or she will "escape" to fuck another guy. No, not for me. I would rather divorce. And if my wife wants the other man, good riddance. I encourage her to go to other man if I am not enough for her. That is me.
As you may remember, the one thing that gnaws at me and find disturbed is her initial reaction that basically, it's only sex, so it's ok. I worry there are other "just sex" guys in the past. I worry that she feels affair is acceptable as long as you don't know about it (which she said she would not want to know if it was just sex).
You have a good plan. Keep working your plan. Consider should there be some consequences.