Howdy, I'm trying to wow some German friends by making a Donauwelle, and I want to overcomplicate things for myself by using different batters as the two layers, (most recipes just use a splinter of the main batter with some cocoa), so I can get a varied mouth feel through the cake and so I can use Dutch process cocoa (which affects leavening) . Is hist even possible or a good idea, and if so what are some considerations I should take?