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In the past when I've encountered this problem I've been able to take a sharp blade (6in wide) and scrape the whole lot off. Only ever done walls that way though and it was easier than any other solution. Doing a ceiling could be a pain though.
I'm not sure the Zinsser will help you, as you say the problem is the old paint's not bonded so anything else that sticks on top of it won't bond either. It does however help to hide the plaster and can give you a bit of body to fill in the patches, I've done touch ups where water damage causes the paint to peel using Zinsser.
I'm glad it's not my job, you have my sympathy.
Airhead
I did a 60/40 mist coat, the problem is the old ceiling paint, the other walls were bare plaster. Decoraters merchant just gave me some Zinsser sealer so we'll see how that goes. Least he could do seeing as we just dropped £600 on Little Greene paint.