I have no idea :? When I bake I usually go by the exact directions and use the exact products. I usually get scared to experiment when baking, but since it is only in the frosting and not the cake then I guess it would be worth a shot.
Looks like it came out nicely :D
I have always baked mine in a bundt pan (the one with the hole in the center), it is interesting to see it in a different shape. Did the icing come out ok with using the simple syrup (sugar and water) :?: