I concur that your poncho and liner are great choices.
I hike the same terrain (and more!).

If you really DO have to spend the night out huddling over a fire - be sure you have 3 ways to make fire and a metal cup, pan or pot to heat water in. This is a great way to add heat to your body by drinking warm water and will give you something to do while you wait for light. (This is my theory. I've not tested it but have made a point of having something to heat water in as part of all my BOBs.)