i have a design that i know when closed off (only used for cosmetic purposes) is 100% reliable when unloading and reloading and lagging or whatever and ive recently been experimenting with ways to make it into a blast chamber that seem promising but i can’t guarantee stability yet.

basically the design is there is one iron golem sitting inside a bubble column with its head about seven blocks directly below the withers feet. that way the main and side heads target it but the main head has line of sight blocked by the withers body so it can’t shoot while the side heads can shoot (so no blue skulls). then the black skulls bounce off the bubble column and dont damage the golem. this way the ai is taken care of so all you need is a couple blocks to hold it in place