Ahh...I ignored the ePublisher thing because I only create LRFs! Silly me
I'll whip up a quick ribbon tab for the beta. I'm just not sure how Word 2003 treats it. The file has to be in the .dotm format to have custom ribbons, and Word 2003 would have to open it in compatibility mode. I don't have 2003 to test it on (I have 2007 at home and work).
I recommend Word 2007 if you can get it...there's a learning curve but it's actually much better than the old versions once you're used to it.