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#11
The keyboard is powered by the USB port. At system boot, power is applied to all keyboard USB ports and any port not disabled in the BIOS. At this point, there is no Windows (Registry) or drivers loaded so the action of keyboard is universal. You still need a keyboard at boot so the USB port can not be disabled. Think of the light as a power on test. There's nothing you can do to change that function.
If it were a "smart" keyboard, it would have battery backup to hold the settings but that doesn't appear to be the case.
In short terms, your SOL.