Dumb question about custom filenames

[kifat]

I'm not an experienced programmer and use Windows. How can I change the extractor settings in Standalone Executable for a specific website without using a template?
Example
For hentaifoundry, the filename template is filename_fmt = "{category}{index}{title}.{extension}"
If you save a picture manually from the website, its name will have the template {user}-{index}-{title2}.{extension}, where title2 is the name without special characters (spaces, colons, etc.).
hentaifoundry_1183675_#27 Contortionist show ♥♥♥😜.jpg - result of gallery-dl
VicoNega-1183675-27_Contortionist_show_.jpg - result of manual download

If I add the line filename_fmt = "{user}-{index}-{title2}.{extension}" to gallery-dl.conf, it will match exactly for simple filenames, but will not match for all.
VicoNega-1183675-#27 Contortionist show ♥♥♥😜.jpg - result of gallery-dl with modified config

I found how hentaifoundry.py gets links and names, and I think I can change the filename to the format I need, but how do I do this for the executable file? Or at least force it to use an external py-script.

[mikf]

With command-line arguments

  -f, --filename FORMAT       Filename format string for downloaded files

or a config file setting:

https://gdl-org.github.io/docs/configuration.html#extractor-filename

{
    "extractor": {
        "hentaifoundry": {
            "filename": "your filename template here"
        }
    }
}

[kifat]

Yes, I used a configuration file.
But I only found a template for {title} that uses the file description (with spaces and special characters).
I'd like to use the template from the file link, where all special characters are replaced with underscores
The examples include this replacement, but it changes every character. So, if there are three characters in a row, you'll get three underscores characters, while the file link will only have one underscore
I couldn't find any other suitable templates, and using rsplit in the same way as in the "hentaifoundry.py" script in the configuration file didn't work.