Interesting, I think you could also get at the data using ResEdit, no? Since it's just PAT# resources? Now I'm curious to try...
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It's too bad because ResEdit is an amazing program, and even has a surprisingly full-featured graphical editor, including for those patterns, with a live preview mode:
https://raw.githubusercontent.com/paulsmith/classic-mac-patt...
Right, I thought I remembered such an editor from back in the day, for editing those patterns. When I was a kid I went all-out with ResEdit, inspecting every single resource in the System and Finder files (and pretty much every application/game I had) ... it was pretty fascinating how much stuff was so easily-editable! I renamed my Trash to "Incinerator" :)