Script Fu? Nope, do you have a link?
I removed that text layer and posted the fixed version in the original post.
It took some trial and error, but I got it.
After getting rid of the layer I had to rebuild my Icon cache, as it kept showing the fudged version, even after replacing the bad icon.
Download GIMP 2.8 Script-FUs Pack (More Than 100 Effects And Filters) ~ Web Upd8: Ubuntu / Linux blog
For the icon you'll need iconify separately:
Create Windows icon from image | GIMP Plugin Registry
For those interested in making (or trying) custom cursors:
How To Create Cursors - Customize.org
RealWorld Cursor Editor - make animated cursors
Cursor Editor (online tool)
Axialis CursorWorkshop - Make cursors for Windows.