You could manually edit the xml file, replacing every "bigimagexx" entry with a URL to the page you want to display instead of to the image itself, and then you'd also have to build a web page for each image.
Do-able, but very labor-intensive and tedious. No way to do something like that automatically without re-programming the application software (and even then you'd still have to build the pages).
Not to mention that all your edits would be over-written the next time you saved your gallery.
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