cestlavie's advice above is spot on. If you feel an occupational order is the best thing for you, your DC and your life at the moment, then get one .
Whether he gets angry or not is proportionately irrelevant when balanced with the safeguarding of your children and their home. The time when his anger was your problem has passed.
FWIW, I also would be wary of whether he's just going through the motions in order to demonstrate he's "changed" - but I reckon that, fortunately, that is a healthy distrust to have at the moment based on recent events.
At the moment, you have been through the mill, your children have witnessed something absolutely horrifying, and I truly believe that you will have more than enough on your plate over the next few months just getting you (you and DC) through this.
He can get on and do what he wants to do/take any advice he needs to/undertake any treatment, but really you've got bigger fish to fry.
I also took Jux's post about the "thin edge of the wedge" to mean that at first it's just getting a foot in the door for a 1 hour visit with the kids, then it's an afternoon on a weekend, then he's staying for dinner, then he's asking if he can crash on the spare bed, then he's just BACK. Don't let that happen - your DC need to feel safe in their home.
I