Tinstaafl,
I thought about generating a Table of Contents (TOC) from a Save Field on each page that uses a unique Heading Style not used elsewhere in the document. Not sure if it will work.
It should do but you will have to manually change the TOC generation to only use the Heading Style you created as it will default to Heading 1/2 etc otherwise. I've added my own style & added the page refs in that style to a ToC, but I haven't got rid of the old headers before.
I would also suggest that you copy & paste the ToC generated as the next round fo changes will add to the TOC whereas you will presumably want to create another list of changed pages.
You may want to take a look at Endnotes as they may help you by creating the list at the endof the document for you, but again at a later revision you may want to clear the previous revision notes?