You can make new versions of those languages and add them to your homebrew source. Then add precludes for the originals that are dependant on the same source. That way you'll only see one of them at a time.
The other option is to have the new ones replace the original, using the replace thing ID field. However, if you wish to maintain your own homebrew source, then there will be no original "Giant" available when your source isn't enabled.
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