Update:
If the file is Paginated, its easier then I thought..
Open your PDF. Crop the Right side, in the crop dialog box uncheck the “Show All Boxes”, Check off “All” on page range, and the last option “Crop:” pick “Odd Pages only. Move to page two, Crop the Left side, Uncheck “Show All Boxes”, Check off “All” on page range, last option “Crop:” pick Even Pages Only”
Now you have a PDF with the first half in order, save it with its own file name.
Load up the original pdf in spreads, repeat the same process again just left side first, and right side second.
Your left with the last half in reverse order. Here you will need Quite Imposing again,
? Plug-Ins > Quite Imposing Plus > Reverse Page Order
Save as a new file, join with the other one, and you have the file back in order.
For the reversing pages, maybe there is a way of doing it automated without getting quite imposing.. not sure,
Quite Imposing Plus & Pit Stop Pro, don’t leave home without it
Keep your stick on the ice,
Cheers