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"]'.