Weaponization has failed (too bad, I wanted to name the squad Fangs Force Four).
1. Training barracks with danger room with appropriate ceiling and floor grates took too long to build (in case a permanent solution was needed).
2. During #1, the vamps have grown progressively mentally unstable.
3. Unbarricading the doors and changing warrens from individual rooms to the training barracks resulted in:
3a. The squad leader (the one with the most military prowess) became insane (seeing cannot pickup equipment, too insane - spammed across the report channel reminded me of Dr. Strangelove). Eventually he was removed from the squad whereupon he went back to his room to be locked in.
3b. The insane mayor stayed in his room the entire time and refused to budge. Also removed from the squad and the door locked again. Maybe he was jealous of the vampire king's 12 000 kills, gold statues, and ridiculous mandates?
3c. The insane fisherdwarf just wandered around the endless rows of barrels filled with alcohol near the grand dining hall. Perhaps a lingering memory of delicious dwarven ale was something he could never rid himself of. It made him miserable. Eventually he went back to his miserable room where he was locked in again.
3d. The vamp king, the one with 12K kills, went on a rampage as soon as the door was unlocked. He immediately swarmed the bedrooms and proceeded to drain the blood of 3 victims (apparently, even with the military stations outside the bedroom - the fact that the king entered the bedroom of a living dwarf, and when he emerged a lifeless corpse was left, did not raise anyone's ire). Eventually he wandered into the training room where he was locked in with iron armor, battleaxes, and a danger alcov.
4. Squad training with the king was inititated.
5. After one year, a minotaur was caught in a cage outside the fortress.
6. Said minotaur was placed in stockpile above ceiling grate above training room.
7. Pitting said minotaur resulted in nothing until...
8. Dealing with an elven caravan, I missed the death notice. Checking the logs, the ferocious Minotaur had charged the Vampire King, surprising him, and dealing a death blow to his brain with a ferocious punch.
9. I am now in process of the flooding the training chamber to deal with said minotaur and retrieve the body for proper disposal. The other three vampires are too insane to be of much use. Magma plumbing is currently being constructed to deal with this gothic problem.