lesschumra, if the kitniyos are less than half of the ingredients in the final product, and it has a reliable hechsher that it has no chometz, you <i>can</i> eat it. Kitniyos is botel berov. You can’t make such a product lechatchila, or give your hechsher to it, but once it’s been made and is botel you can eat it gezunterheit.
The same applies if you’re eating in a Sefardi house on Pesach. If they serve a dish of rice and meat cooked together, you can’t eat the rice but you can eat the meat. And you can certainly eat from their keilim without any qualms.