Hmm. Actually, one way to prevents seeing interactions with page posts is to hide all posts from that page. It may take a while to build up the blacklist, but that's how I've blocked most political idiocy from my feed.
Because we're patching an existing app, adding complex logic is kind of tough. I guess I should revisit the whole smali thing - if I can find a way to inject my own code blocks (rather than do spot patching of individual instructions), I know of a place in the app that can be hooked to filter out feed stories. But, invoking a java function with nothing but a hex editor is a little beyond my ability right now