Set up your firewall to keep the updater from calling home.
You said — “Set up your firewall to keep the updater from calling home.”
A good firewall enhancer for the Mac OS X is ...
The DoorStop X Security Suite
http://www.opendoor.com/doorstopsuite/
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Also, I would get ...
Little Snitch
http://www.obdev.at/products/littlesnitch/index.html
Both are excellent...