Oh god, I just realized how amazing what I said before would be
Have several chests in a room, perhaps in plain view of the player the entire time, and every time they make a mistake have it rigged to blow up a chest and its contents
Or if you could move Bedrock with a piston you could have a chest in a Bedrock box with a 1x1 opening to grab the loot but if you mess up it closes
You start to think like Vechs when you watch his videos for too long, lol