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I do wonder how functional the original drive needs to be... I wonder if it would still talk the correct temperature talk if the PCB was removed from the drive (for space) and only power and the temp sense wires connected... hmmm... 
(Admittedly not an elegant solution! lol!)
I *think* it relies on the drive firmware being up and running, so that probably won't work... My understanding is that they repurpose the activity LED output as some sort of digital encoding of the temperature, FW change only.
Oh well, so much for the lash-up and maniacal laughter solution!
If/when you make a neat solution, it would be super if it worked for the older iMac's too ;-)
- Willing guinea-pig with selection of Atmel chips here 
(I really shouldn't be so lazy and just get the scope out)
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