Can you add a special chest and sign that you can craft with like enderpearls and other stuff. First you place the sign and the chest down after that you can click the sign and put items in it. Then you close the menu of the sign and after that all the items are transported to the chest.
Also only the person that placed the chest down can open it. Maybe you can even make a double chest from 2 chests and maybe you can use hoppers and other chest, but you can only place 1 special chest down.
It can help if you kill mobs in pwarps (/wwarps), like creepers = you get so much gunpowder you can’t just pick it all up. So if the pwarp owner places a sign down you can put you mob drops in it and they wil be transported to the chest so you other people can’t just steal all the drops.
You call this a worse version of an auto storage :/