It's been a long while since I've done this, but I recall working in LAB color space (in Photoshop) and did whatever only on the lightness channel. Of course you need a color image, and you must remember to change back to your final colorspace before exporting. Sometimes the camera manufacturer's own terrible software will have moire reduction that helps with a specific camera. Topaz DeNoiseAI is a standalone/plugin than might work. You could try the trial.