When I saw the idea of a crafting recipe for Endermen in Story Mode I was a bit inspired. There could be many special items in the game made by Endermen placing a dedicated arrangement of blocks in an area 3x3 like the standard crafting grid. There would be a slight twist to this. The event would only register on blocks specifically crafted and placed by players for this purpose. The optimum set up for this would be in the End with Endermen recipe specific blocks generally nearby and the "Endermen Crafting Table" multi-block relatively nearby (they do tend to teleport a lot). If completed the item would either already be placed on top of the structure or would be considered on display like an item in a pedestal to preserve it. All of the items produced would have an Ender theme and would manipulate teleportation, travel, volumes of space, and other End related themes. An "Ender Jammer" that would block/redirect nearby teleportation effects would be an idea for an item they could craft or even a Vanilla Chunk Loader. Note that to balance out any high-tier items produced this way you would have to rely on the random and limited nature of Endermen block placement (the structure would be a universal placer for Endermen).
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If regular is Vanilla then what flavor is your Minecraft?