Hmm, I wouldn't use bone dragons, since you can't heal them. That I would use is Tirexes. They can eat a dead body and regain their full HP, and when they kill an enemy, they eat it up (unless it is a plant, machanical, undead, etc.) and restore their HP. However, mixing a high-HP unit in an undead army will result in certain morale penalties for the Tirex (-1, Low).
However, I think you may try that with red dragons. The Red Dragon has 870 HP, and can survive a lvl 1 sacrifice. Then you can heal them up. As for the charm-sacrifice, I think it still works. Hypnosis-sacrifice should also work.
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