So, in trying to plan for all eventualities, I'm trying to put together a game plan for what to do if I have to go to ground unexpectedly. I use a full length underquilt, a SnugFit, so I don't carry any type of pad. What I do have is a Tyvek ground sheet.
My current game plan is to use the tarp with trekking pole for weather protection, the Tyvek ground sheet as, well, a ground sheet, and my Warbonnet Blackbird as a mosquito net, also tied to the trekking poles. What's missing in the equation is any sort of ground insultation. The UQ and TQ can be used for warmth above me, but I would have nothing for under me.
I thought about piling leaves, pine needles, etc. under the ground sheet for some form of insulation. I could sleep on top of any non-down clothing I'm carrying.