Continuing to learn processing. This time I stacked in Siril with extraction of hydrogen and oxygen channels, then separated the stars in PixInsight, stretched, cleaned up the noise as best I could, and used pixel math to combine the channels R(Ha) G((Ha+OIII)/2) B(OIII). The star channels were combined using the same formula, then I overlaid the stars on the nebula without changing the colors, only adding a bit of saturation. I sharpened the stars as much as I could — if anyone knows how to get nice-looking stars without paid plugins, I'd appreciate any info.
P.S. I forgot to do background neutralization, will need to redo it)
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