If you don't care about anything that is in the headers and footers in the PDF, try cropping the page to omit them (there are lots of free/open-source editors out there that will crop the page — just don't use any Adobe product, they don't actually "crop" but "mask"). This might turn a 6x9 (printed size, US sizing) page to 6x8.25. Then, to be certain, run the cropped PDF through a PDF printer (to create a new PDF), and use that last PDF as the source for any later conversions/editing/whatever.
I've done this process with journal articles from Springer with about 80% success. It's been about 60% success with books, but it's a small sample size (and the fails were from OUP).
The downside is that you'll lose page numbering, but that's actually easier to put back in later either manually (iteratively inserting a naming anchor) or with a regexp search-and-replace than it is to deal with textual headers/footers via regexp.
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