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I think this sounds dangerous, personally. We're planning almost this same thing as a chestband component of the system we're working on. I consider the upper torso best because if you look at the test video you see the subjects instinctively move centered on the area where they feel the sensation.
But this would have to be transdermal as an implant(s) and require a power source(s) and have all kinds of associated problems, some as noted above (some not, like what about clothing?). As a wearable it's basically easy and trouble free... sort of like armor, too.
Not to seem like a nay-sayer or anything.
Have you considered these: http://ns.umich.edu/htdocs/releases/story.php?id=8386 I don't think you can buy them yet, but probably soon. My biggest concern would probably be how much waste heat do they generate?