If you WARN them what you are planning they will soften the area such that your exposure will be negligible.
Example : If you threaten to call your H's workplace and expose to HR your H will call HR FIRST and warn HR that his wife is "mentally unstable" and to ignore any of her calls.
NEVER REVEAL your hand when you play poker my dear... you raise or fold, and keep your cards close...
This is a game of courage... you are playing it well, but you need to raise your game a bit...
Get his parents MORE involved and expose to his HR department..
if he gets fired that's fine... You lose the $$ but you also lose the OW along with it... I should think thnat's worth the financial hit until your H finds a new place to work