Thanks for the suggestions, everyone! I'm a little reluctant to run 240V AC around the scope for safety reasons, since I'm usually set up in a grass paddock with lots of dew around and randomly tripping over things in the dark.
The Canon genuine 5DmkII's batteries are rated as 7.2V, but the genuine AC adapter output is rated around 8.1V - seems like the camera is somewhat flexible with voltages?
Hopefully, Jaycar's 12V -> 7.5V adapter will work well with a DC coupler.
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