Im not sure, but how about keeping the backing on the cake that what I have done when im not sure about something.
i've put fbct's on Pastry Pride, a non-dairy whipped topping, with success. it has qualities similar to whipped cream so i think you should be okay. there's more of a tendency for colors to bleed on the wet icing, so i try to make sure my bright or dark colors are not actually in contact with the icing... i put a good background layer of buttercream on my fbct. hope that made sense.
ok I missed read your question Im think Frosting sheet. Sorry about that... I think this question have been asked before and someone said yes you can...
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