We'll create fresh WordPress site with Admin email change installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Admin email change without send confirmation mail.
Once you have installed and activated your plugin, You can able to change the admin email from Settings >> General. Update the admin email and click on the change email button then admin email will be changed without sending confirmation mail. If you click on the save changes button it can not change the admin email without confirmation mail.