I think Living Dead should be changed in a simple way:

While Living Dead is active HP cannot fall below 1 for 20 seconds (10 seconds in PvP).

You will still need the healer to heal you before it wears off, but if the healer fails to heal you to full you wont get KO'd by your own skill. Simple, effective, and does not punish you for the faults of another player.

Though it does kind of turn into an anti-tankbuster skill.