Remove Moiré from Artwork Scans

I have four high-resolution artwork scans (600 dpi, ~25 MB each, JPEG) that show a noticeable Moiré pattern in the backgrounds. I’m looking for a skilled retoucher who can run an FFT filter in GIMP—or an equally effective tool of your choice—to knock the pattern down to the point where it is no longer distracting. My target result is somewhere between a solid moderate reduction and, if possible, a clean removal; I don’t need any colour, brightness, or contrast tweaks once the pattern is gone.

You’ll receive a download link to the originals and I’d like the finished JPEGs returned in the same resolution and colour profile. Please let me know how you plan to tackle the FFT process and roughly how long you’ll need. A quick before-and-after preview on the first image will help us confirm we’re on the right track before you proceed with the rest.