You would need to create a filter/hook for the wp_list_pages function, and then modify it’s output.
Contact me on Twitter if you’re still trying to do this…
@acedrew
Simply define the function anywhere else, no need for hooks or filters, WordPress searchs for the function before using the one in pluggable.php
More Detail here: http://codex.ww.wp.xz.cn/Pluggable_Functions
Andrew Rodgers
