I'm using WordPress multisite and need to display content across all subsites in the sidebar. This is a network of 50+ sites so updating all 50+ sidebars with this content every few days is not practical.
One solution I've found is to simply insert the content I want into sidebar.php in the theme editor, though I don't want my client editing this file, and want them to use TinyMCE editor instead of HTML.
Another idea was to embed an iframe into each subsite and have my client update the page that the iframe was referencing.
And the final idea I had was to create a plugin with the TinyMCE editor that would inject code into the sidebar.php file when saved, though I don't know if access to editing theme files is available to plugins.
Is there a better solution that I'm not thinking of? I tried a few plugins with no success, did I miss one?