Sorry, I have to disagree with your estimate, for the main
reason that all those reviewers will be manipulating the Word
document with their own formatting quirks, which will only serve to
corrupt the doc file and make its repeated importation increasingly
problematic.
Remember, you're looking to convert a binary file with tons
of macros into HTML code, essentially a flat text file. I suspect
that remapping the IDs will end up being the least of your problems
as you go further into repeated review cycles.
Good luck,
Leon