I built the End Room around the End City portal out of all the right stuff in the right places, all the emerald and gold blocks, enchanting table below, and set up an identical surface one with the End Crystal on the enchanting table,
But throwing Ender eyes at it isn't detonating the crystal or creating the portal cube.

But seriously - let me walk into my end chest in a pocket dimension - by building an identical sealed room around a portal in the end where throwing and ender eye at a certain side of it takes us to the unused sides (where it already kicks you out at Dragon's Nest).

How else do you one-up Shulker Boxes?