Urban Giraffe Support

I am using a plugin (Feed Wrangler: http://ephramzerb.com/projects/feed-wrangler/) to add an additional feed for my wordpress site.

I can access the feed via: http://blog.mydomain.com/feed/mycustomfeed/

I have urls within my site that invite users to subscribe to that feed.

I have "burned" the feed with feedburner so that the burned address is:
http://feeds.feedburner.com/foobarfeed

How can I use the redirection plugin to redirect my url to the feedburner url, unless the request to the feed is coming from feedburner. (Not doing so would put the request into a loop, right?)

Do I need to use a referer redirect or agent redirect or combination?

Thanks,

-Kyle