1.21 Trial Key + Vault Ideas

So one of the many things people have concerns about are the Trial Key and The Vault..
The Trial Key from surface looks like it only has one use and same for The Vault and as far as I can see the lack of features for these items will be the very downfall..
The Trial Key should be a useable item in creating locks for items such as Doors, Trapdoors, Chests etc.
This is a good way at preventing mobs from entering such as villagers, and in adventure mod making maps a little more fun to work with like making fetch quests to progress forward but this time its a key to open the next area..
It may help with Survival in keeping players out to a degree..

The Vault however seems pretty cool, I am chill with the idea but however the working of it being its in one place is sad since it looks like it has major redstone capabilities..
I know the loot right now are placeholder loot but I would also love to see a more unique line of loot coming from The Vault and especially ones that may help in the progression of finding structures, snazzing up your armour, listening to Trial Music Discs and more..
Giving the player the ability to get items that are so desired in a more mixed loot pool would have them coming back..
Also the Shrieker effect or what I call it atleast, by picking up an unpickable block doesnt give the player the actual blocks functioning but a more redstone capable and decorative block version of the block..
As how you did back in 1.19 with the Shrieker..