Unfortunately there isn't a way of changing the content in mass for personal pages using Luminate's built-in functionality. This either must be done manually by an admin, or the participant. The easiest way to do this manually from the admin side would be to edit each personal page and click "Replace with Default Page" which will mimic the same setup that your TeamRaiser has for the Default Personal Page.

There is also the possibility of Blackbaud doing this for you via data cleanup project or staff augmentation. If you are interested in either of these solutions, please contact your Account Manager.