You can up the voltage to 240 and re-use the wiring (with some minor mods to the ends), for double the power. Insulation class should be sufficient. That makes good sense anyway. You may still have an issue if the powersupply can't handle 240/60 but for most of the ones that I've used that would have worked. Better check with the manufacturer to be sure though. It's a lot easier and faster than rewiring.