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

Scratch the bark on a couple of the limbs with no new growth. If they are green than they should eventually grow new leaves. If they are dead then prune them and over time the tree will grow new branches there.

Don't give up. Shriveled leaves can be caused by many things, like leaf miners. In the case of leaf miners, it is mostly cosmetic damage & the leaf will remain green & continue to do its job of photosynthesis. Treat for the leaf miners and new growth will be fine.

It is far too late to plant new citrus. That is best done in February. Anything planted now will suffer in the summer heat & not have sufficient feeder roots to cope with hot, dry weather. If you do chance it, you'll need to monitor it every day & water accordingly. It can keel over from improper watering (too much or too little).

It takes patience to deal with fruit trees--they bloom & grow on an annual cycle. Better to prune off the deadwood from an established tree and give it a couple years to recover. If you started over with a new tree, you'd be in for the same 2-3 years wait for it to be productive anyway.

All of my citrus survived this winter's deep freeze, but only 2 of 5 set any fruit this year. They are focusing their energies on staying alive, not on reproducing (fruiting). I'm sure next year will offer a bumper crop if this winter is mild.

OK, so it's now as a hammer dead above ground with green shoots coming from the roots. I assume those will be some worthless species used for the graft? When do I replace, and what should I know about varieties?

I have 3 Satsumas in SW Miss that I transplanted from S La. after Katrina. I planted them on the south side of my house, near a couple window. If it gets lower than 20 degrees, I hang a large piece of heavy plastic from my gutter or try to cover the tree as best as I can. I then crack a window near the tree, hoping for some heat, and hope for the best. 16 years and still going, even through the ice storm of last year.
Works for me.

let the suckers grow from the rootstock for now, then in late winter collect some equivalent-thickness donor branches (scion) from a friend or neighbor of whatever citrus you want to grow (or more than one!) and graft onto your rootstock suckers.

Plenty of great tutorials on yutube. A razorblade and rubberbands is all that you really need, though a roll of paraffin tape is handy to keep the scion and joint from drying out before union occurs.

You've got a head start in the old rootball and can create your own tree.

my great uncle did this and grafted a satsuma and kumquat onto the same root stock...had a combo citrus tree

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

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So, should I just go buy new trees and then graft branches from those?

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Do you know of anyone that has a good producing tree already established?

I have bought trees for the sole purpose of taking a small branch for grafting, then given the tree way. But I usually raid the orchard of a fellow Gardener

If you have the room, There is nothing wrong with more trees! and you may find that location goes a long way towards surviving the worst of the winter cold.