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Hey Mark,
Not quite what you're asking and maybe not better, but different. I take flats using my laptop screen as a source of light.
I set my background to white, move applications out of the way/minimize them, and then set SGP to start capturing in 10 seconds. That gives me enough time to position the screen over my scope.
From there, I take 25x0.3s exposures. The exposure time will vary depending on your scope, your camera and screen brightness so you'd need to experiment a bit, but I am for the spike on the histogram to be about 1/3 of the way from the left.
Anyway, just food for thought.
Cheers,
Lee
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