I kind of hate the taste of it but I would have difficulty finding rice milk powder. (dessertswithbenefits.com)
You can use Better Than Rice Milk Powder as a substitute if you're avoiding soy. (willfrolicforfood.com)
i wonder if you could sub the Vanilla Rice Milk Powder for 1/2 cup + 1 T powdered rice bran (or just powdered rice, so rice flour) and 1/2 + 1 T cup brown rice protein powder...? (dessertswithbenefits.com)