Change Responsive Projects to a Fluid Box project

I know that you cannot change a responsive project into a fluid box project. But, I was wondering what is the best way to get the content moved to a Fluid box project. Can you click a button to change the responsive project to a regualr project and then automatically change the new regular project to fluid boxes. This would be nice since we have access to responsive projects through ELB, but not Fluid boxes. Thanks, Delphine