I am a CASA.
It is very important to discuss trauma/ ACEs generally with these kids, especially the ones over 10 or 12, because we help them connect the dots of their own lives. They learn that the terrible way they feel is not a character flaw but rather the result of trauma which was not their fault. Connecting those dots is empowering and de-shaming.
I would think about the best way of helping CASAs approach the subject of ACEs in a compassionate, direct age-appropriate way. Helping them know what their child may be feeling, and what kind of support or reassurance they can give.
Maybe giving a survey IS a gentle way to bring up the topic... but so is mentioning the topic of self care, abuse, healing, trauma, ACEs, etc in a conversational way. We cant be ashamed of our kids' experiences and we model this by being frank, direct, and compassionate.