I agree with the others. Cut off the conversation as soon as it strays from the basics. I did a lot of hanging up before my X got the point that I was serious. He figured it out within 24 hours. Thereafter, anytime he started to stray off into quacking I would say something like "If you'd like to continue to discuss the children we will, but if you want to talk about x,y,z then I am hanging up now"
Would your lawyer be able to put something in writing that he has until (pick a date) to sign the necessary forms to have his name removed from documents and accounts? I know it is a lot of leg work on your part to get the accounts and policies seperated. It feels like every time you finish the forms for one account, there are two more accounts to deal with. They multiply like rabbits. The good news is that this will be over soon!
You're making progress!
Take care of you. (((())))