There's !Polandball, though it hasn't seen a lot of traffic.

If you just want a feed of the comics submitted to /r/polandball, lemmit.online runs a bot that will create a community on that instance and automatically mirror the posts on a subreddit. If you go to !requests and issue a request (post title consisting of "/r/polandball"), it'll create it and you can subcribe to that.

It won't mirror comments, though, which may or may not matter for you.