AFAIK, there are no tours of Kodak at all anymore. There were in days gone by.
Fred and I often meet at GEH, and we have a rather irregular lunch group as well. We are overdue for a lunch.
Saturday is fine with me for lunch. IDK about a private tour though. That would have to be arranged with more lead time and it would have to be a weekday. There are regular tours that go through the entire GEH home and exhibits, but tours beyond the locked doors into the restoration areas are by appointment only.