Storing arbitrary items in 1.21 vaults

I’ve just watched the announcement and I definitely like the vault but I think it could have some more features. How about implementing that when a player right-clicks the vault with a trial key in their offhand, the key gets assigned an ID, the item stack in their main hand gets moved to the vault‘s inventory and said stack can only be retrieved using the key used to insert the item or a copy of that key(just like written books) which would give us some sort of „team enderchest“ which could be useful on servers like lifesteal. In my opinon, it isn‘t too overpowered since you need one key per stack and since first, items with different NBT data can‘t be stacked it quickly takes up a lot of inventory space, and second, obtaining the key by simply killing someone would of course grant you access to the vault. Also, you should be able to reuse keys that already have been assigned an ID. And last, since the vault is meant to be used by different players, maybe implement that it‘s only mineable if multiple players(adjustable throug a gamerule) are mining it simultaneously so that at least most of the players would have to be fine with the vault getting mined.