The current way that DynamicSettings installs wikis, such as extending the installer is not working due to the way MediaWiki works now with 1.39, overriding anything with the installer requires the SettingsBuilder. Instead, what we can do, is simply execute some SQL that is derived from tables_generated in MediaWiki /maintenance directory; this is what CreateWiki does.

Although, we would lose the ability to make changes to the installer, but since we'll generate our own LocalSettings.php file anyway, this isn't that big of a deal.