Try the NPC for UNC and see if you would be eligible for FA, given 3 kids in college over a 5 year period. I am not sure how they will calculate multiple kids in college with the new Fafsa changes - you can call and ask.
Keep in mind that there is a 19% cap on OOS students.
I would take a look at Alabama’s merit awards. For many (all?) of the schools you listed it is going to be very difficult to get the cost down to $25,000-30,000 a year.