What else will remove a balancer

Safest way is to get it to a mechanic and get them to crack it with a heavy duty pneumatic impact gun, they can nip it up and it will be safe to drive home, otherwise lock the engine at the ring gear (remove starter ) use a suitable lever and undo, or lock socket bar against ground and with coils out kit the key, this often shocks the nut loose, but this is dangerous ans person injury or damage can resault if it is not done right.