Since shulkers hold the bulk of your items in the endgame, and netherrite can protect things from lava, I propose that if you surround a shulker by netherrite ingots in a crafting table, you get a netherrite shulker box
To download the other ones you need to make a folder in the versions folder for minecraft and put the client and JSON file for the versions in there. They all need to be named the same aside from file extensions. Once you do that, you will be able to choose that version when making a new profile with the minecraft launcher.
I was about to make this exact suggestion. It would be incredibly useful since people die by lava quite a lot.
I noticed lava runs faster in the nether too, it has caught me and my friends out a few times. But this is why I intend to bring plenty of cobblestone on me when I do things in the nether, one for blocking the lava, 2 as a blast proof material against the Ghasts.
But nether rite materials and items would be wonderful, it would mean I wouldn't have to worry about accidentally dropped swords in lava pools or what not, and a shulker box made of netherrite would sweeten the deal. It would also mean I wouldn't have to help friends out if they had accidents in the nether. If they remembered where they died, they could retrieve dropped items after going back in or respawning there after the new update allows it.
Could make it hold like a double chest worth of slots if upgraded with netherite also
That would be useful, it would effectively expand the capacity of ender chests too if the nether rite shulker chests could be made into double shulker chests. Allowing people more private loot to protect their rares in, but honestly I feel like this ought to be the limit of what can be stored in the ender chest, as at that point each player would already have more rares than they could possibly need during survival gameplay. If I managed to get a surplus still I'd be willing to share it with others.