If you have a large scale sign shop where you live. One that does vehicle wraps, they could duplicate the logo and print with a dye-sublimation printer and cut the decal. The artwork might be the only deterrent. Do you have any good photos of an original decal, if so. It could be re-drawn/duplicated in Corel. We are also engravers, silversmiths and jewelers, so we have cad/cam capabilities and use Corel and other graphic programs, for duplicating brands, logos for conchos etc.. We also have a sign/decal cutter, but it would be only 1 color. Dye-Sub printers do amazing stuff.
Robert
www.cowboyjewelers.com