There is a process known as the RT Blanking system that allows you to cut out desired shape. Developed by Roger Taylor in England and now used extensively by many jewelers and metalsmiths for inexpensive short run cutouts of sheet metal. The Blanking System and tools used to help make the dies are available from Rio Grande and Bonny Doon produces great tools for cutting dies and the presses used to stamp out the designs from the dies.
Here is a link to a website that shows this system in use to produce multiple shields used on a trophy.
I suggest you spend some time investigating these options and contact Rio Grande and Bonny Doon or visite their websites to see if this may be the solution you need for your needs.
Hope this helps and please let us know how things work out.