To whom does editorial control of the book's cover and flyleaf belong? Does the publishing contract give such control to Bellisle or to the publisher?
If the publisher has such control, I'd suggest publishing the book but with a slightly revised cover design to the effect of "Read how liberal scholars nearly denegrated two centuries of history to the scrap heap." Viewed in that life, the book should continue to be published, just as should be Mein Kampf and The Communist Manifesto.