Replacing the nut isn't too hard. Just get an exacto-knife and use it to detach anything sticking to the nut on both sides of it. Then line up something small and hard (like a small metal rod) with the nut on one side, then gently tap it out sidways with a hammer. Once it's out a little, just grab it with pliers and pull it out. Easy peasy :)
I'm a Graph Tech fanboy, so I'm behind you on the trem-nut installation! ;) But if Earvana use TUSQ material on their nuts, then it's worth a peek... :idea: