Good stuff. Glad it works.
I always forget that filenames and directry names can contain spaces. If there is a danger of this, then the magick command should have filenames quoted, eg:
magick ^
"%1" ^
( +clone -resize "1080^>" -write "f:\web\im\%~n1_a.jpg" +delete ) ^
-resize "2160^>" "f:\web\im\%~n1_b.jpg"
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