Thanks! I have replaced “wpdrudge-main-css” with “mytheme-css”. You can replace any text in the site’s page source using “replace in html” option, but make sure that you don’t replace css class names and script variables as it might break the site.
We only offer this WP plugin. But do not overload your site with too many security plugins. You can use HMWP along with any other security plugin like wordfence, ithemes security, etc.