You couldn't even make a 5W USB-C cable if you tried. You'd have to make the wires so thin that it would burn at above 1A I guess, and it would have no way to signal the device to limit its power consumption to 1A, so it would just burn once you tried to use it. All you need to handle 60W is to make three electrical connections between the ends, and the cable won't work at all if you miss any.