Photoshop :: Shortcut For Linking Layers?

I work on a lot of files with 4-6 layers each, and then need to link them to create layer sets, to move them onto other files, where I combine the whole lot (we have a photographic studio, so it's for multiple images in wedding 'books' rather than separate photographs in albums).

I deal with hundreds of files a week, so I'm trying to automate it as far as possible. I've got most of it sorted, but I can't find any command or shortcut to link all of the layers. Is there one? For now, I've set up an action that links each individual layer and then creates the set, but that only works when I've got the same number of layers each time.