Couple of thoughts as I play the awesome 20.13:
What with all the junk I end up carrying around, the most useful craftable item the Necronomicon could offer me is something that adds to my inventory management skill. Suggestions for the item: a coffin, funerary pottery, some kind of bag filled with horrors or a death carriage.
An option under "Dismembering Corpses" to extract blood and possibly bones, without the other items. This would still destroy the corpse, so it's obviously not preferable, but sometimes you want to make bloodwine, gold or bread of the dead without having to clear out 13 spaces in your inventory.