You could always carry a large bag (ziplock,sil-nyl,whatever) and stuff it with native materials; then put this bag into the hammock under the knees/calves/feet. The bag would probably weigh 2oz at the most? I'm thinking about the smallest NeoAir for this application-your thoughts? The NeoAir seat is 10x20 and 2.5ounce....ideally the pad (if you carry one for the feet/calves would do double duty as also be a sit pad during the day...I don't think I'd really use the NeoAir Seat as a sit pad-they just seem too fragil for this on the trail...
ooops forgot to point out the advantage of the NeoAir Seat-packability..it will pack down to nothing compared to a CCF pad which will take up pack room.