@rrrrrok @samsethi @evan @270016 Currently there isn't because of the way Mastodon behaves. It wants everything to have been actually delivered to the sharedInbox before it will be visible to users on the instance.
I can see sending a command to the actor like maybe "catalog" or something that would then send you the entire back catalog. After doing that once (any user) all the past episodes would be visible on the instance for everyone. A little pain in your timeline though.