I submit this with the assumption that it would not be possible in explorer mode : If code isn't TOO spaghetti, explorer mode should be a kinda "read only" instance so it doesn't create a real instance on the server. I could be wrong.

But the idea could be another take on Ocean Fishing : rotation of different dungeons to go gathering in.
Could even include the other gathering classes, making it some kinda mini Diadem.

And It would allow for maps that aren't available in explorer mode, like alliance raids (Mach and Ivalice raid both have some nice fishing spots).