A retired Green Beret wrote a strategy called "One Tribe At A Time." It's an interesting idea, similar to yours. Might be interesting for you to check it out.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.globalsecurity.org/military/library/report/2009/2009_one_tribe_at_a_time.pdf&ved=2ahUKEwjn4N6j0LjyAhUhT98KHbhXDRIQFnoECCcQAQ&usg=AOvVaw3R817Ne5NFXQ_Fq2w6YZeC
Someone wrote a book about him, the paper, and his life.
https://www.amazon.com/dp/0062114999/ref=cm_sw_r_cp_apa_glt_fabc_82CSQS7M7Z8CC33WCNHG?_encoding=UTF8&psc=1