Fantastic!!! I didn't even think of this, but this is an excellent idea.
I'm starting work on what I hope to make a browser extension to automatically connect back to your primary instance of choice if you visit another instance. Doing so cause I got tired of having it be that I'd visit an instance (like from the Rust subreddit) and not have it be linked to here so I can follow stuff. I'll have it be a user can set their primary instance, then when they visit another one, they can easily have it connect back properly so they can follow communities and interact there.
(Apologies if that sounded confusing... I'm still not sure on all the verbage for the Fediverse. Hopefully it'll make sense when I release it x3 )