i think the dash prop is only doing about 1400rpm in the cruise. the centrifigal force close to the hub at that speed is not great, but it will fling excess ice off. as long as the ice forms evenly (as it would) balance would not be a huge issue. the hub is not anti/de iced, but the blades are, for this reason. from memory the inlet is electrically anti-iced, but ice may form behind the inlet boot.