Turns out there is a chest full of upgrade templates right under the center of the map "nether". The last guy remaining was camping on a skybase btw so I had the entire map and the remaining lucky blocks on it all to myself. Not gonna lie, I didn't even know it was possible (it is only possible on that specific map, though, and even then it relies on luck to get enough diamonds because sadly you can't just craft netherite gear anymore).
