The best method will probably be to just cut them from a chunk of steel or wrought iron and file to shape. If you don't like hacksawing that much you might consider buying one of the portable bandsaws mounted on a stand. These cut fast and are pretty affordable. One of the big keys will be to get the styling just right. You might want to take the time to make something out of wood first to develop the form.Jim
There was a recent post on the Hershel House Facebook page showing the steps of lock reconversion by someone who I believe is a member here, and it was very well done and had some great photos. You could find it there, but I'm guessing that the author of it will probably post here with a response and photos once he sees your inquiry.