I believe it is best to intervene while the children are at the youngest possible age. You do not need to convince me that this is a community where children can flourish. It helps when everybody in the community feels a responsibility towards its children.
However, I also understand that you have developed a best practice, a program that has proven its worth. I imagine this program, in partnership with friendship centres and with all winning conditions met, could assist in helping those children. This program has been subsidized and constitutes a best practice. If it were implemented more widely, this would help a way to help first nations children.