Maybe just using masks would do it. Depending on the imaging software you use find a Yahoo tech group that supports the software and pose the question.
I have ImagesPlus which has a discussion group - the method is discussed about how to produce pics of comet+tail+pinpoint stars - the results are good as in -https://www.flickr.com/photos/laurie_astronomy/16318484681/
The best exposure for the disc of Jupiter is underexposed, which eliminates moons...
GlennB
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