I don't think the SYLM arrangement was done to mimick the unplugged era. I always got the impression that the SYLM arrangement was done to mimic the Eagles Hell Freezes Over show where they played a couple songs more mellow, bringing everyone front and center for a couple songs. FM is always following the Eagles.
https://www.youtube.com/watch?v=v5MOvVnetbw
https://www.youtube.com/watch?v=WKnfGqYOdrw
They even both start out with the thumb picked intro change.
Even recorded the concert at the same venue.