Harmonicators - I love it. Sounds like you were inspired by 2 of my favorite harmonica players: Stevie Wonder and Lee Oskar!
Stevie mostly plays chromatic as you mention Fingertips, but he does play diatonic on Boogie On Reggae Woman as I discuss in this post. I’m not aware of any other songs he plays diatonic on. I have discovered that I can play his solo on “Isn’t She Lovely” on a Lee Oskar Melody Maker key of E though!
Lee Oskar is a great harmonica player, a great person, and has a funny accent, being Danish. So I’m guessing you have a funny accent too? 
I also love War!
Welcome to the forum my friend! Glad to have you here.
Aloha,
Luke