I'm trying to make a Golem Mob that range attacks the same mobs as an iron golem.

I'm trying to recreate the plank golem from MC Legends and everythings gone really smoothly up until I wanted to set up the AI to attack the same mobs as the iron golem. The problem is that I can't use Iron Golem behavior to fix the problem as its a ranged mob but I also can't use Mob Entity or Monster Entity because then the Golem attacks creepers causing an unnecessary explosion.