The only thing that I would be concerned about, is that the SNPA clone is a heavier, bolder beer than the one you want to put on the cake. I'm sure it would be fine, but don't be surprised if the taste isn't quite what you expect. SNPA is a much hoppier beer. All that said, if I were in your shoes, I'd give it shot. Why not, no matter what, you still make beer!