I'll go ahead and back the LA -0*, but I have a decidedly different perspective on a player using a Yellow Musk Zombie, because they're explicitly the "prenatal" state of the Yellow Musk Creeper. All decision-making is coming from the "seed", not the host creature, so the character is the yet-to-be-"born" Yellow Musk Creeper. Consequently, I'd basically treat it as a one-up where the Zombie's death has the player go on as the Creeper an hour later.

And because this is explicitly the mechanism of reproduction, Inherited Templates would be present in the "spawned" Yellow Musk Creeper. Spellwarped makes for a particularly bothersome option that also covers the need for higher Intelligence on the Zombies, though set-to templates or Awaken are required for the Creeper itself.