Well, there's always Zonguldrok:
Henzell wrote:+9,+9 bone longsword. 20% chance per turn of hostile animate dead. Note that fighting these hostile undead provides more exp and piety than sacrificing corpses would. Not as much food, though! Even wielding this is bad if you worship one of the good gods.
Unfortunately, there's no way I know to
increase corpse drops from monsters. Kiku does have a corpse delivery service though, which while intended for necromantic purposes, can also be used if you've got the munchies.
If the corpse / chunk game has you down, play something that has a way around it. The undead, ravenous trolls, iron bellied kobolds, vegetarian spriggans, or even rot tolerant orcs all provide escape from the usual tedium of maintaining one fresh chunk in inventory to eat when you fall to hungry.