What an excellent idea for reaching out to students and it's good to hear your school of choice for your children's education.I just want to highlight this part.. In a formal school setting, each child has a variety of adults to choose from if they feel they need help, and hopefully there'd be at least one adult they would trust among the staff. With H/S, there may only be immediate family and if one of them is an abuser, the child may not feel safe talking to anyone in the house.
My kids go to quite a progressive school (by irish standards.. for other Irish people in the thread, it's an Educate Together school) and they have posters up in various places throughout the school basically saying "If I need to talk to someone I can go to..." and then each poster has photos of two different staff members, their name, and where in the building they can usually be found during the school day, and those staff are trained for those specific scenarios. Prompts and training like that may be absent from H/S settings.
Also there are times when a girl/boy may confide in their best friend or group of close friends and one of them goes to their parent(s )or a designated school teacher/staffer and tells them what the abused friend told them.