I may have to see her shortly to do kid exchange...I'll just keep it strictly kid exchange.
Yes, just take the kids, tell them to say bye to mommy and turn your back on her and go, in either of your current conditions, a few words will escalate into something much larger and much more vocal and you don't need that with the kids around. If she starts an argument, tell her "I won't argue or discuss any of this in front of the kids, you can email me later if you need to say something to me"
Note, I said "email", not phone or text message, she will probably say "why email?", and you can just respond with "I have to go, talk to you later"
You have to give her the impression that you are done with her, when you talk to her and "validate" her, you don't give her this impression, you always appear to be the attention seeking spouse who wants back into the relationship - this part has to change.