I've responded to this even though it has been posted for a while because it is hard finding GF cereal of suitable consistancy for babies to eat.
I've started feeding this to my 11mth old who's on a GF diet. I found that if I left it to soak for a little while in the formula, drained some of this milk off, and then added a little more fresh formula it took the vast majority of sweetness away. Be careful that you don't leave it too long though or the cereal will just end up tasting like cornmeal! Just don't give it dry as a snack.