If i understood your question... yes, you can submit your feed to directories.
My advice is to submit your burned feed (with FB).
(A) Hosted Feed Url >>> (B) FeedBurner Url >>> Submit This Url to Feed Dirs
If (A) goes offline, (B) remains intact. All you have to do is edit (B) and
enter your new Hosted Feed Url.
Good Luck My Friend.
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Thanks to those who add rep.