If you are running Apache with mod_rewrite enabed, you could just rewrite the URL's in an .htaccess file in your web root dir. Something like ...
RewriteRule ^forum/showthread.php?t=(\d+) component/option=com_whatever?t=$1
Sorry, couldn't copy your exact component path as your links above are hosed up. Basically, the $1 in the Joomla side of the rule is whatever matched the (\d+) in the vB side.
-- hugh
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