I tried for awhile to figure out a setup that could elegantly go from hanging to ground and never did really come up with a good solution. I really did not like having a pad in my hammock. There were times where it was acceptable, but as soon as I pulled it the hammock became infinitely more comfortable.
I went with an excellent custom underquilt (Te-Wa!!!) and it is a dream for hammocking. Can't take it to the ground, though. I think the most likely tolerable compromise would be a 2 layer hammock with CC foam in between the layers. I don't need a 6th hammock, though, so I just commit to the air or the ground and deal with it