You can't get the wallpaper without doing fondant, since they screen print it directly on the fondant. But you just peel off the fondant and there's buttercream underneath it. Also, Disney's fondant isn't like any fondant you've had elsewhere. It's sort of marshmallowy, and over the years I've seen many many fondant haters end up loving it. Either way, there's always that buttercream on the cake.
You can try ordering the cake by calling the number for Art of Animation in Post #2 of this thread. Their cakes are made by Yacht & Beach Club, which has the capability to do fancy cakes. But AoA won't let you speak directly with a pastry chef, and you cannot order a cake for delivery to AoA by contacting Yacht & Beach Club directly.
The easiest place to work with is the Contemporary, so if you have an ADR at any of that resort's restaurants, that might be your best bet. You can send them the photo at the email in Post #2 and find out how simple you'd need to go to keep the price under $75, if that's possible.