I know you recently added Rebrandly to go along with Bitly but I'd love to see the self hosted shortener YOURLS supported as well. @norcross created this great plugin for supporting YOURLS https://wordpress.org/support/plugin/yourls-link-creator/ that you may be able to leverage. https://github.com/norcross/yourls-link-creator

Here is their API if you wanted to call it directly
https://github.com/YOURLS/YOURLS/wiki/Remote-API