Sure, why not?

I don't know how to draw on pix, but I'd cut it just above that curve (3-4") & re-root it, DRY, smallest possible clay pot.

Don't know if the lower portion will sprout; hard to tell from here if the roots are gone or not. If mine, I'd toss 'em. At least from the brown portion down seems gone to me. I'd cut it off about 1" up on that straight piece of silver stem.

Thanks. I'll try that. I never really thought about the possibility of the top being alive with the roots dead, or pretty much. Succulents are strange. Hopefully I'll have an after picture.

If you have a healthy tip with leaves, just take it and root it. Let it dry for a few days and form a callus before you plant it. Always make sure you are cutting through a healthy portion of the stem. If you cut through a rotten portion of the stem, clean and sterilize the shear before you try to cut higher. Always make sure you cut through the healthy tissue and keep the cut as sharp and clean as possible.

I would also try to grow it from leaves - after all, it is crassula, and most grow easily from leaves. I have C. mesembryanthoides ssp. mesembryanthoides (similar leaves to tetragona, but covered in hairs).

Here is a leaf - one of few - that fell off and was left in the pot. I found it rooted and is growing plantlet. I hope it survives! since I just uncovered roots to take photo. Lower photo is a tip of the branch that I broke off by handling; left on surface in same pot, it has rooted. So I would try to root yours, it may work! Btw, plants are in gritty mix, 2 different pots:

Leaves would be ideal because I could potentially get a bigger sized plant. I've tried in the past but they're so tiny, they just shrivel away to nothing. I'll try again though. Can't hurt. Thanks.

I've done what Karen and asclepiad_fan have suggested.