My take, with sharpening the goal. The coin was messing up the stats. I began by trimming it out and then doing a crop based on the detail of the image.
PhotoFlow blend HL, RCD demosaicing, vignetting and CA correction, no-clip linear float.
gmic trim, focus, brighten (HLG), sharpen (guided), sharpen (LoG), resize, sharpen (LoG)
v2 sharpen (guided) in log2 space
