I actually think that he might be able to basically make one with just his divine crafting abilities. He can give objects abilities that are related to it's purpose but shouldn't naturally be there. So he could make some kind of "assassination journal" that makes people die as it's written in the book. Even if he couldn't do it with just one of them those abilities have been so heavily enhanced that he should be able to just make one if he felt like it. He wouldn't of course but he totally should be able to.Joe can probably make one at this point, if you think about it. He has enough expertise in curses to do so, as well as enchanting and spellcrafting to achieve the same functions of a Death Note with much less limitations.