In Episerver 4.31 we used a plugin that changed pagetype for pages. If I wanted page 1234 to be changed from PageType X to PageType Y I just ran the plugin in admin mode. This plugin was developed by Episerver.
Where can I find a similar plugin for CMS 5 sp2?
At the moment we are working on gettings the tools out on our support site. In the meen time I would advice you to contact the support.