I think that's the best approach without DSLR cooling. For cooled cameras the only change would be to create a separate temperature/iso/duration dark library. I have a suspicion that darks taken at the same shutter speed as flats is adequate for flat calibration - that is, dark flats. These are easily processed as bias frames in programs such as PIs BPP.
My workflow for any program would be 1. create master bias (moot point)/dark flat; 2. flat calibration and master flat creation; 3. create master dark (no calibration); 4. Calibrate lights with master dark and master flat; 5. DeBayer, align etc.,
I think this better preserves DSLR data integrity, given the relative non-linearity of DSLR RAW data.
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