Change site name & site URL listed in RSS feed?

[Ceaseless Skies]

I'm running vB 3.7.2 with no mods.

I'm wondering how I could modify external.php to change two data fields in the RSS feed for my vB forums. Specifically, I would like to change the channel <title> and <link> fields from the forums title and URL ($vboptions variables [bbtitle] and [bburl]) to my homepage title and URL ($vboptions variables [hometitle] and [homeurl]).

How could I go about doing that?

Thanks very much.