How does plating silver help? Theres no reason to think it would be any flatter then the silicon die. In fact since you're just allowing molecules to settle where they will it could be very, very course depending on minute elctrical differences within the silicone chip.
If anything you should be looking at plateing the base of the waterblock, but even then I see no reason to assume you can plate something and not make the existing valleys worse. Anyone ever see those childerns chemistry kits that make staligmits by chemically plating a flat surface?
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Has anyone ever looked into low temperature solders? Since those form a continuous metallic layer from the die to the water, I think they'd be ideal. I even remember seeing a few that had melting temps in the lower 100sC. Drop that a few degrees and it might be practical on a CPU.
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