Maybe he could get a Ghost writer. Try pitching the idea to a few of the bigger publishing houses. Publishers have lists of Ghost writers for just this purpose. They could work with Jack and the publisher could benefit from his name. I would suggest cold calling some of the major publishers (make sure before hand that the publisher actually publishes art books) to get the right names of people you should be speaking with (i.e. Non-Fiction Editor and Chief of the Arts Department). Usually the receptionist can help you with this. Once you get the right person then call the person directly. It will not be easy but this could be one way to get it republished.
"Creativity emerges only when the imagination is given the freedom it deserves."