re: Satsuma recovery(from cold) - died, need to replace

kumquats and satsumas are the most cold hardy citrus, and you are definitely at the northern end of citrus viability there in central LA. Either one, or any other citrus, would do well on your root stock otherwise, though.

The main advantage of grafting is you will probably be quicker to fruit production, and you can select exactly what variety or varieties you wish to grow