after some more research I am waiting for more ingredients before I brew my gluten-free partial mash beer next weekend. Decided to keep sorghum syrup below 12% of total grist/sugars (originally had it at 60%), so instead I will use a combination of brown rice syrup, malted oats, flaked maize, sorghum syrup, D2 syrup, and add some gelatinized gluten-free cereal and beta amylase powder into the mashed portion.