The answer is way simpler now you can now make mobs FULLY invincible. Here's how: /summon Cow ~0 ~0 ~0 {Invulnerable:1} Easy! If you want to spawn any other mob, just change the "Cow" to the name of whatever mob you like. If you were to spawn a zombie, the zombie will still burn in daylight but will not take any damage from it.
To get the villagers on that chunk. Then save their locations in a hashmap that stores the chunk and an array of the villagers locations. Then create another event listening for chunkloads and if that chunk is in the hashmap loop through the location array and spawn a villager at each locations reapplying the potion effects.
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how to make zombie villager spawn
