I’ve updated the Coinwidget Shortcode plugin with a branch of the original code from https://github.com/alvinhkh/CoinWidget.
This includes support for Dogecoin and I fixed some issues with the way that the options are parsed so that they can all be overridden successfully.
The latest version of the plugin can be downloaded from https://wordpress.org/plugins/coinwidget-shortcode/.
See the Coinwidget Shortcode Plugin page for more details.