is there a plugin that works on wpmu to convert a page to a post and saves the comments

I'm re-working my site and am moving things that were incorrectly created as pages from pages to posts. Some of these pages have readers' comments that I want to keep intact. Is there a plug-in that will do this? I have installed 2 (convert post types by Stephanie Leary and Post Type Switcher by johnjamesjacoby). They both show up in my wpmu dashboard, but neither show up in the dashboard for any of my sites even with having 'system activate' enabled.