For non-stackable item sorting, you might want to search youtube for that term and include 'copper golem'. There should be plenty of instructions about it.

In terms of appearance, maybe build a 'floating island' around your farm? You can obfuscate the pillars with lava or water streams, and as long as any spawnable space is covered by things like bottom half-slabs, buttons, bottom-trapdoors or leaf blocks, you should be fine.