I like your idea of just shifting your focus on posts. Just don't touch on anything legal (sorry you don't have that sounding board) and keep it to FS related.
I feel you don't really care if H reads and that's cool. I feel a bit similarly. If my W reads here it's a greater insight to my process than she'd ever get otherwise. Not that it's owed, but it doesn't really bother me. We shared a life for 10 years, then we didn't. She shouldn't be shocked by my pain or even any contradictory statements. It's a crazy thing to go through for anyone, and emotions and working out our feelings/thoughts is something everyone should have a space for. Ours happens to be online.
I don't think your H ever has (to my limited knowledge via you, of course) had any intentions to hurt you in any way. He may have known that it would happen - of course it would happen! - but it wasn't the goal. So with that in mind, I think you and I *may* feel similarly in that it's okay if the X or STBX reads here. They haven't yet shown the need to use the information maliciously, as others have.
Some spouses here truly have gone off the rails. That's not our experience. So exercising caution is important, but letting them know that we're still humans who hurt isn't likely to lead to more intentional hurt on our parts.