Not a goner, yet.

It probably won't survive the 5-1-1.

try a mix of sand and cactus mix. The dirt has to be fine enough to fill in between the roots.

I grow in the 5-1-1 using terra cotta pots and have good success. As long as the root mass looks yellowish and they aren’t all brown, and also seem moist, it’s worth trying to save!

"Probably won't survive the 5:1:1." Untrue. If it doesn't survive, it's demise would be much more likely related to roots drying out while the tree was being worked. The 5:1:1 mix offers much greater opportunity for the plant to realize a larger measure of it's genetic potential than more water-retentive media. I've repotted thousands of plants in both the 5:1:1 and gritty mix w/o issue, and I continue that practice not because I have anything to prove, it simply works soo much better and eliminates completely the stress of root congestion.

No matter what grow medium @Margaret OH uses, it will be essential to work the soil into the voids in the root mass. I typically use the homemade white nylon tool bottom row 4th from right to so that, adding a cup or two of soil at a time, but the wooden tool bottom 2nd from right works equally well as a root pick (to remove or work soil into the root mass) or a 'tell' to determine when it's time to water.

Insert the tool into the roots, add soil, then rotate the tool so the top of the tool rotates in a large circle and the bottom in a small circle - barely at all. You'll be able to easily see the soil moving into the soil. It reminds me of a whirlpool or how water starts to swirl in a cyclonic fashion as it goes down the drain. Because the 5:1:1 mix has a lot of large particles is no reason to think it won't be easy to work a homogeneous mix of the medium into the roots.

Tip: To 'break' any grow medium's tendency to repel water when it's dry, put about half the soil you'll be using to pot the plant into a bucket/bowl. Add plenty of water and stir the mix vigorously. It should be saturated. Then, add the other half of the dry soil and mix. Allow the mix to rest for a half hour or so while you get things ready for the repot

I agree that a low fired/ terra cotta clay pot is probably the best choice for the plant. The water in the initial (soaking wet) half of the medium will diffuse into the dry half within 30 minutes or so, 'breaking' the dry half of the soil's tendency to repel water. The medium should be slightly damp when you repot, just damp enough that it can no longer repel water while you're working it into the roots. If you're working with the gritty mix. You can soak the roots in water, then pot the plant in dry soil and water immediately. It's easier to get the dry gritty mix worked into the root mass, but you need to work quickly to prevent the roots from drying out. It takes only a few minutes to dry the fine roots out enough that they perish, which represents a setback while these roots regenerate.

Generally, any plant I repot is pushing new growth inside of 1-2 weeks. An insignificantly small price to pay for a couple of years of growth and improved vitality unimpeded by the inherent stress associated with root congestion.

Al