I recently came across https://skeptics.stackexchange.com/q/2678/104 , a question that is very interesting, but is (IMO) off-topic for Skeptics.SE and on-topic for History.SE .
The main post about migrating old questions is Disable migration for questions older than 60 days
Therefore, I think the real solution is much simpler: just disable the migration of old questions. They're rarely welcomed or heavily improved post-migration, often overtly disliked by folks on the destination site, and can end up causing a rather bad experience for folks who were participating in good faith on the original.
doesn't seem to apply for this question. This question is not garbage, and allowing moderator migration of non-trilogy questions won't open up the floodgates to garbage - by far the majority of garbage is generated on the trilogy sites.
The justification for closing it on Skeptics.SE is so that people new to Skeptics will know what is and isn't on-topic.
The justification for migrating it to History.SE is that if someone's looking for information on the history of great circles, they shouldn't need to search Skeptics.SE for that information. Should they ask the exact same question on History.SE?