JMO, but unless the A is done during company time on at the place of business....don't you think a boss would just laugh at a letter from a desparate LBH? If the OM is a good employee, then that is what's important to the boss. Unless it is some Christian sponsored business, then sadly, in most cases I doubt employers think the community cares whether OM is having an A with your W or not. But like I said...that's just my opinion.
My question to you is "if" your W is willing to have 100% transparency, then why do you feel that you need to send this letter to "boil" the OM? If I have understood what Puppy has said to posters, contacting employers was to bust the A.
Please don't be like some other LBH's who think that you can have somebody other than you to take care of this problem. The problem is your W's infildelity. Deal with her instead of going to OM's boss.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!