something like this should work via cmd:
"C:\path\to\magick.exe" "C:\path\to\input.png" -channel R -ordered-dither o4x4,32 -channel G -ordered-dither o4x4,64 -channel B -ordered-dither o4x4,32 +channel -strip "C:\path\to\output.png"
In the end you may not need this at all. If your backgrounds...