This is really interesting, Janice. Do you happen to know if the same approach is true with UK university presses?
I have been working off and on at a book about the history and development of the Spanish resort of Benidorm. It is probably too quirky a title to attract regular publisher interest in an unpublished author, but perhaps this avenue might work.
I'm a little reluctant to spend time I don't really have doing further research and conducting interviews without some hope that it won't simply languish unread in self-publishing hell.