Meh, I would go the ATP route leave your options open. There are a lot of opportunities that will be available outside of Republic/Lift by the time you hit ATP mins. Plus by the time you reach ATP mins, who knows what the landscape will be like today's top regionals may not be the top ones in a few years. These things goes in cycles and constantly changes. No need to lock yourself into an airline today when you aren't even going to be in the market for a few years.
My vote from speaking from experience of seeing how things change rapidly from 2014 when I started flight training to 2018 when I started at my regional, to today. Go ATP route.
Why not go to a regular Part 61 school if you have money ready to go?