In case anyone is interested, I’ve created a version of this that runs as a Windows application rather than as a Notepad++ plugin, so it works in all applications:
This should be considered experimental. Since it works everywhere, not just in Notepad++, it has more potential to mess things up if I’ve missed something.
Since it has no connection to Notepad++ (other than being a spin-off of the plugin described in the original topic message):
The convenience features for editing a user definitions file which I added in response to @PeterJones’ notes aren’t included.
Further discussion will be off-topic here. Please raise questions and concerns in the Issues for the project.
The actions to create GitHub pages are, for some reason and at least temporarily, not working on this repository, which affects the normal presentation of the help file. However, you can still read the help file here (though some links appear to be garbled).