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I assume that it's cast? I wonder if you could get the fins milled off to leave a flat surface and then fit a SLM or DMSL 3D printed replacement blade set? Probably not cost effective unless you have an impossible to get part.
The pitting I've come across was a water pump on an enduro bike. I figured a bit of it was the alloy the blades were made of had corroded which makes me think that it was the anti freeze component. Cavitation is maybe possible but the blades operate in a closed chamber which means when the pump spins up the pressure in the pump rises which would tend to suppress cavitation.
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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