score:4
I would find a photocopy machine capable of handling larger than US letter-sized paper. Most non-tiny copy shops, like a FedEx Office, can do this for a small charge. Place the document on the glass, set the copier settings (or get the staff to help you) to scan the larger document and reduce it onto a smaller piece of paper, and copy. You could also scan it with a sufficiently large scanner and print a copy onto letter-sized paper. A photograph taken with a scanning app might work too, though you'd want to be sure it really looks just like a photocopy or risk rejection.
Keep in mind that the State Department requirements are that you bring (in addition to the application and ID and ID photocopy and all the other required documents detailed on the linked page):