sandblasting should not deform the metal at all.
also ever seen those vibrating engravers? that could be used to make your channels, they are what $12 at a hardware store? I used to use them to engrave on glass, just take the tip and sand it to a finer point. could also be used to give the surface a sandblasted finish.
Hell, rub the metal on some course 60 gritt paper. that will do it too.
FIX
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