Just an update, I tried this and it turned out pretty good.
Used about 1/4 tsp of salt for 1 cup of water. Used an old/leftover plug in power adapter (output 11VDC 50Ma), cut off the end and added alligator clips. And 12 Q-tips per word. Takes a while to do, but it's easy and cheap! I've got about $5 into it (minus my time, which I have plenty of
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Just a note, don't use black tape/vinyl for the mask. The aluminum turns black during the process, so I didn't notice the center of the A lift off at some point (I got lucky it happened towards the end).