Well, yes, of course you could get a switch for your accessories. In fact, most accessories like grip heaters come with switches, otherwise people would complain about hot hands in the summer time.
But as I mentioned in my original post, they're not on switched power. This means that anybody walking by and flicking a switch on your bike can leave you stranded with a dead battery. That is why I recommend tapping the horn circuit instead. Then only people with keys to your bike can kill your battery.
Wes
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