The system I'm working on is a Publishing site that has page layouts created with SharePoint Designer. Users have created content pages based on these page layouts.
I want to update the page layouts via a Feature in a WSP. Of course the page layouts are customized because they were created in SharePoint Designer and I know that I can't replace customized page layouts with a Module. However, I also can't revert the page layouts to the template because there is no template. I also cannot delete the existing page layouts and replace them with the ones from the WSP because the page layouts are in use.
So I need a strategy to update page layouts that were created using SharePoint Designer with those contained in a WSP.