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Not sure I qualify for the "best and brightest", but I'll give it a go for a DIY solution...
You could just add a long resistor(s) up by the light and power them off the defogging circuit. Probably in parallel with the actual window.
You'd need to find the appropriate cable(s), measure voltage and current, then figure out the overall resistance of the window (V/I=R). If I'm remembering circuits right, you would count the lines across the window and multiply the total window resistance by that amount to get the individual elements resistance. Probably would want to multiply that by 2 or 3 at least since you don't need that much heat and you don't want to affect the functionality of the actual defogger. That number becomes what you want total resistance to be make sure the resistor(s) are rated to handle the input power so you don't set the car on fire. Connect in parallel with the window circuit and you are done, probably. If you blow a fuse you need more resistance.
If you don't mind running more wire, you could probably just run a separate circuit off the fuse box or something.
PS. I'm not responsible if anyone electricutes themselves trying this. I'm just a dude on the internet.
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