So this plugin will simply give a user a "Key" which could be any item, Once they have recieve that key from voting, they're able to /warp Key and then click that key on the chest, Once the key has been clicked they should get an item. Nodes - Crate.Key.Normal - Crate.Key.* Thanks for whoever comes through!
Hm maybe you could use phatloots loot bags and give them to voters? I never tried it though. Loot bags are similar to what you want, but in your inventory and you just click them to get an item/s or random item/s.