Is there a script that can package and collect composite fonts?

Yes, but there's an important difference between a normal font and a composite font.

A composite font isn't really a font file. It's a definition that tells InDesign which actual fonts to use for particular character ranges. So a script which simply loops through `doc.fonts` and copies each font's `.location`, like the script in the older thread, isn't really sufficient for composite fonts.

InDesign does expose composite fonts to scripting through `document.compositeFonts`, and each composite font has `compositeFontEntries`. Each entry contains the applied font and font style, so in principle a script can walk through the composite font, find every component font, resolve the actual font file and copy those files.

There is also now a Composite Fonts script by Peter Kahrel:

https://creativepro.com/composite-fonts/

Peter notes that when a document containing composite fonts is packaged, the composite fonts are included in the package.

I'd therefore try InDesign's native Package command first rather than a script that manually copies `font.location`. A script can also call `document.packageForPrint()` with font copying enabled.

The other thing to remember is that the composite-font definition itself is separate from the actual OpenType/TrueType font files. InDesign stores composite-font definitions in its `CompositeFont` preferences folder.

So, if the requirement is to make a completely portable package, I think the safest approach would be:

1. Let InDesign package the document normally.
2. Check the component fonts referenced by each `compositeFontEntry`.
3. Verify that every component font exists in Document Fonts.
4. Also preserve the composite-font definition.

Fonts which cannot legally or technically be copied may still be skipped, so no script should blindly assume that every `.location` can be copied.

It would certainly be possible to write a script specifically for this which reports the composite font, all of its component fonts, their file locations, and whether each one was successfully collected.