Mike, have you seen this mod this guy is developing for Phpbb stand alone, is there a chance this will be ported to Nuke 6.5?

http://www.codemonkeyx.net/forums/news_viewnews.php

and the discussion about this port @phpbb forum is here
http://phpbb.com/phpBB/viewtopic.php?t=69725

Cheers,
ConKien