its not as serious as it sounds, id go as far as to say i am not really bothered, all it is is the little bolted on metal skeg that protects the prop if drying out on hard ground, but if i make sure the prop blades are horizontal when drying then it will not be a concern.
the previous owner actually had a spare as it was showing signs of galvanic corrosion, unfortunately i forgot to get it off him.
i suspect its only an hour job but the boat would need to be out of the water.