Parent Template that when changed would automatically change all 10 of my clients templates?

     Perhaps the Convert to Seperation Model approach will serve--at least as long as the change is to the interface and not the data model.

     For cases where you have to change a table or field definition, you still don't have to repeat the same changes for every client. Instead, you deploy one new copy of the data file and use an import records script to import the data in to the new copy of the file.