I don’t care about getting sent to the original instance per se. Getting sent to a landing page on the local instance that says "Hey, we aren’t federated with that instance, and/or no one on our instance has subscribed to that community. Here’s an externalized(http/url) link to the content you’ve attempted to access, with no guarantee it will work.

Understand that you may have to make an account with that instance or an instance federated with them if you wish to actually interact with this content."