Example for fighting: Maybe you could send the KS book with something he loves to see and a note, "If you ever want to try this...strings only attached to tie your hands to the bed" or something like that.
YES, he may not even reply. That doesn't mean he didn't think about it.
Maybe that is a little overkill, but you know your H. One thing that brought me back was having my W offer sex. I wasn't so sure I wanted to work things out, but a hug grew into something more, and it was a good reminder of a reason I wanted to be M at that moment. It doesn't solve problems, but it does offer hope.