I created some scripts -fu scripts that I used on my mac. I always put them in:
/Applications/Gimp.app/Content/Resources/share/Gimp/2.0/scripts/
And in my case I would add an "<Image>/Filters/Render"underscore, so_"<Image>/Filters/Render"
Hope this helps, it's been a while since I messed around with this.
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