Dunno how much work this would be, but you could change the forum links to strip characters past the thread ID (number) in the URLs. That would work, because the forum only needs the number (old vB style forum links still work, too). I.e showthread.php?ID-here or showthread.php?t=ID-here both work.
It goes without saying that people can use the same approach to manually fix links/URLs.
Bookmarks