Aren't there a couple stock switch locations on the left that could have OE switches popped in? Maybe not on the STI.
You could also rig something off the high beams I would think A relay so that the stereo wouldn't get the feed unless the highs had been on at some point. So a quick flash at night would turn on the relay to feed the head unit until you shut the lights completely off.
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I am a Commodore PET --- Now get off my lawn you kids...
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