I'm not going to win any prizes here.
But,
just in case there's anything useful in these two articles, here are two links.
http://epubsecrets.com/formatting-po...pub-part-1.php
http://www.pigsgourdsandwikis.com/20...poetry-on.html
There's probably nothing there as you seem to be pretty expert already and just want to achieve something very specific. So...
I hand you back to the MR experts.