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You don't convert the flat to colour Geoff; it is a calibration frame. My reasoning, FWIW is that if there exists within the flat frame any bias toward one or two of the primary colours. that will translate as a colour caste to the final colour image. By having a G2V raw and calibrating that, when it is susequently colour converted, and balanced, the same colour values will give a correctly balance image of whatever it is you are imaging. The G2V is used as a reference colour, and adjusting the colour scaling at the time of colour conversion such that the resulting image of the G2V star has equal values of RGB, should therefore result in correct colour in subsequent images calibrated with the same set of flat frames.
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