You are praising him taking ownership of his choices, you want to reinforce that... You don't want to accept apologies for them, but you can praise him for taking ownership... Just make sure he knows an "I'm sorry" for his behaviour does NOT count for anything.
Your answers were quite good.. .the only one I would ADD is on his needing a support system :
When you want to repair a marriage you talk to someone trained to repair a marriage, OW is acting to DESTROY a marriage... that is NOT a support system... She's a one-woman a demolition team
You do need support, but you need someone trained to do that properly, she is not a licensed family therapist.. If she was she would have lost her license and be a pariah by now... Having sex with the people you are trying to help is an egregious violation of ethics and trust.
Those would be good too, but I am more than happy with your answer.
Just giving you a few more ideas... I always see a family therapist as a positive influence and an anti-affair person.
I told my wife when she was cheating
You talking to OM 40 hours a week and talking to a family therapist for ONE hour a week is NOT going to make a damn bit of difference in our marriage. Do the math.