zombie animations / classes and AI

Wondering if it is possible to create a new class of zombie without creating a new mod.
Basically I'm trying to have a zombie (movement & behaviours) same as the viral version but with a player skin.

The effect is that on player death, this class of zombie would spawn in with a player skin simulating the player turning into a zombie ( zombie face skin and players old gear on them would be fantastic).

Possible without a full mod?
 
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