Feedback ScriptedImporter - Support multiple file extensions to create custom variations (MyFile.loca.txt)

Would it be possible to make ScriptedImporters deal with multiple file extensions? I'm currently trying to import special text files, but the ScriptedImporter logs an error, that the file type "txt" is already handled by a native Unity importer. As a workaround, I can use a custom extension such as MyFile.loca, but that makes the workflow more difficult in other places. For example, when exporting files from Microsoft Excel it's not possible to set a custom extension in some cases, so I'd rather use a double extension such as ".loca.txt". Also, changing the extension to something custom means that a regular text editor won't recognize the file unless users tell it so.