I've released a WordPress plugin that shows a FeedLand river on a page or post: feedland-rivers.

Drop the shortcode `[feedland-rivers]' onto a page, point it at your FeedLand username in the settings, and it fetches the river JSON server-side and renders it in an isolated iframe. No FeedLand front-end scripts, no third-party fonts or stylesheets beyond an optional favicon lookup. Here is an example.

You can also show more than one river on a site by overriding the username, category or server per shortcode instance, e.g. '[feedland-rivers username="alice" category="tech"]'.

It's not on the WordPress.org plugin directory yet. Grab the zip from the latest release and upload it via Plugins > Add New > Upload.

I'd appreciate beta testers. Let me know in the issues if something looks wrong or the instructions are unclear.