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The serial number is programmed into the OTP register
This can be read with vcgencmd otp_dump
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I just wanted to draw your attention to the fact that your schematics will not work and will likely kill your electronics.
In your first schematic, you apply +12V to RPi GPIO pins (through R1, D1 path) which will kill the RPi.
In your second schematic, the 12V power supply is wired in a way that produces 0V on the (+) terminal and -12V on the (-). As a ...
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I'm a bit unclear on your exact question, but here's a couple of thoughts based on what it seems you're trying to do:
Re. power dissipation in a semiconductor:
You may be all over this already, and if so, please excuse me for being pedantic, but the important thing in selecting a semiconductor (MOSFET in this case) for a power switching application is ...
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