all that I really want to avoid is an answer like "I would use all my detailed 21-st century scientific knowledge to do something that a native couldn't possibly do".
How about "I would use all my detailed 21-st century scientific knowledge to be concerned about something that a native couldn't possibly be concerned about"?
Sure, if it leads to an interesting point.
For example, if you were trying to avoid suffering: "I would kill 12 year old Hitler" isn't very interesting, but "I would do BLAH to improve European relations" or "There's nothing I could do" are interesting.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.