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Yep, I agree with Doitsu, ImageMagick is probably your best bet.
Could you attach some of these JP2s (maybe 10 pages) into a ZIP so we could fiddle around? (Or just link to the Archive.org page?)
Another potential workflow is to use ImageMagick to convert from JPG2000 -> TIFF, then import those into ScanTailor (which can do a lot of the Normalization/Cropping + B/W conversions).
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