Making index.rss redirect work in WP2.0.1

An old version of my blog (from blosxom) used index.rss as its rss feed, and several readers still use that. In WP1.5.2, I used a RewriteRule in .htaccess to redirect that to the rss feed.
RewriteRule ^index.rss/?$ /blog/index.php?&feed=rss2 [QSA,L]

In WP2.0.1, https://www.nehrlich.com/blog/index.rss points to the regular blog page with posts regardless of whether I include the RewriteRule or not. I’ve poked around a bit in the support forums and can’t find an answer to my question. Anybody have any ideas about how to make a RewriteRule that actually works?

Thanks!