Chris,
what's the status of the Post View fix?
It should be easy to update it:
1. In the old system, read sequentially all articles (or a counter file, if designed in such a way), write a temporary counter file, one line per article - first field the article name or id, second field the Pre March 16 count)
2. Switch to the new system. Read sequentially all articles (or a counter file, if designed in such a way), read corresponding record in the temporary counter file, add that value to the Post March 16 count, update the said count, repeat until end of file.