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Ice will be anywhere around.
You can not cool CMOS chip only and prevent the ice forming, say on nearby shutter (and shutter is very sensitive contraption.. I had a problem with it recently, something happened to my 400D when shutter worked but not quite.. enough to invoke "error99" message on the screen), without throughout re-design of the camera.
EDIT
Now, if you immerse the whole thing in oil..
The electronics may or may not work at -30°C...
And, oil must be transparent enough...
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