How to dynamically switch PageLayout and MasterPage of SharePoint Publishing page?

Question

To improve both the editing and displaying experience of SharePoint WCM Publishing pages I would like to be able to switch to a special set of Masterpage/PageLayout when in edit

Answer 1

Surely that would require subclassing Microsoft.SharePoint.Publishing.PublishingLayoutPage and use that to render the contents of the actual PublishingLayoutPage required depending on the "edit mode".

How to get a master page changed...ek.