exclude layer from download

Hi,

knows anybody a solution to exclude a layer from download? From export is clear, but i want, that customers can download the same data on frontend which i can export after a placed order. So they don't have to order.

Background: a customer want, that his employees can design their own buttons. But he don't want separate orders. He will collect the print ready files and send with one message. This makes also sense for me and reduces my work.

Thanks for every hint!