Bought some cow blood and animal man blood from the caravans. As I suspected, no cigar. Vampire no likey old, non-dwarven blood from a barrel.
I wonder, if I give him a child, if he will report the corpse as dead, and bury it inside it's walled off lair.
I'm picturing a child chained to the floor in the middle of an otherwise empty room, with a flood gate on one side, and a walled off hallway on the other. A lever in the hallway is pulled, the floodgate opens, and Urist McBloodSucker walks into the chamber ...
Urist doesn't want to be fed, he wants to hunt.
So we let him play "the most dangerous game" instead!
Workaround for alcohol and feeding problems:
Make a beastman servitor race become alcohol dependant in the raws, and make them vamp and werewolf immune, and release a contact toxin that causes sleeping that they are *not* immune to. Drop booze and the vampire into a sealed isolation ward filled with them. Urist McVampire needs a farm plot, a brewery, and whatever else you decide to give him. He grows food, turns it into booze, which the penned in beastmen promptly steal (and ideally consume.) They see urist mcvampire, and spew the sleepy contaminant everywhere. Urist mcvampire never sleeps. If he does fall unconcious, it won't be for long. The other were creatures however, not so much. They fall asleep, are full of booze, and have the sentient tag. Vampire eats them, and feels extraspecialawesome.
Science is needed.
Alternative random idea: creature venom causes thirst. See if alcohol dependant dwarf vampire drinks booze.... bees would be ideal if not for the "needs path to outside" issue.... can bees go through a fortification?