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You don't have to go the full extent of flat darks and bias. I really just meant flats and darks. Flats make a HUGE difference to your final image.
You won't be able to use flats from the february session. Unless you have a permanent setup where you don't change the camera angle, focus etc, then you have to redo flats after each session.
Make yourself a lightbox so you can do them at any time after the imaging session, before you change focus, camera angle etc. Using t-shirt and sky flats is fine but surely more inconvenient than a lightbox.
Median combine for lights will get rid of the satellite trails etc. So yes, you can try it for your lights and your darks.
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