I think I'll leave it for now and retry capturing it in RAW and process it properly.
For now, here they are.
I stacked the images with inverse opacity as Itchy suggested.
In today's final edition, each of the images (before the final flattening) was enhanced with curves, hue/saturation, exposure, slight leveling and channel mixing. No noise reduction, but unsharp masking was performed after the image was reduced for the forum.