Another idea for a shirt, this one coming from a settler and fervent Indigenous ally: "Rather spend my money on the Rez"
My partner and I were driving through Komoks First Nation reservation and I wished to buy gas at that gas station rather than outside the reserve. I said this statement and my partner laughed and said that should be printed on a tshirt or bumper sticker. I don't know if you'll find it as funny/cheeky, but I am offering the idea over to you :)
In solidarity,
Robert & Stevee