You can set up a new document and Place the old version in - by using this script
You can choose to import by reverse page order.
Might need to setup some details on a master page to hide any page numbers and insert new numbers - etc.
If you are using OSX this AppleScript will do it
tell application "Adobe InDesign CS6"
set n to pages per document of document preferences of active document
tell active document
set c to 1
repeat with i from 1 to n
move page n to before page c
set c to (c + 1)
display dialog "Done"
I love the simplicity and purity of AppleScript code ... Thanks Rob.
[Works fine with ID CC 2014!]