Allen - I never sat down inlaws for a "this is my plan talk". I did ask father in law to remind H of family values, etc. He did - his parents really gave H hell over this. So much so that they chose to move out of his house. They are supporting the marriage and not their son's behavior.
But, if I choose to expose at workplace I will need to circle back and let them know that this was done out of desire to save the marriage and NOT a desire for revenge. Exposing at workplace is an extreme move and other people around me would need to be educated on how this was the act of a rational wife, not a highly emotional one who flew off the deep end.