Minnie Mouse & Whipped Cream

Here’s my question….

I have a customer who wants a whipped cream cake with whipped cream filling and strawberries. On the top of the cake she would like some picture of Minnie Mouse. I said no problem.
Then it dawned on me, I dont think I can do a buttercream transfer on top of a whipped cream cake.
What are my other options? HEEEEELLLLPPPP
I have a kopykake but I dont feel comfortable enough to do a design in gel (if that is even an option).
Can anyone help me here…..any ideas?

Ansa