Hey John,
I made a mass change in abbreviations a while back, and I used Keyboard Maestro to do the majority of the work by driving the UI and doing find/replace on the clipboard.
It creates a report of the metadata tags Spotlight sees for the selected file in the Finder and opens it in TextEdit.
That batch wouldn't be too hard to clean up, although you'll have to have the Satimage.osax installed for some of them to work.
I'll fool with them over the weekend.
-Chris