Let me give you a different opinion. Cables have no effect on sound whatsoever. A cable is for moving electrons, and a coat hanger will work as well as your 99.999% oxygen free silver - not to mention the fact that your silver wire will cost more than the pk3 itself.
Instead just go ahead and solder on a
right angle 3.5mm plug to replace your old one. It'll will cost you only a few dollars, and be more durable than straight plugs. Problem solved. If you can't work a soldering iron, do you have any friends that can? Most people wouldn't mind - the "job" won't take more than minute or two.