We had a red velvet cake with cream cheese filling for our anniversary last month. It was delivered to our room at YC.
I called private dining there and after talking to a few CM's, I was given the email address for the pastry chef. I emailed him what I wanted, along with pictures and my phone number. He called me back and we talked for about 15min. He was WONDERFUL to work with!!!
Our cake was a custom cake and did cost a little more. I'm not sure about any of the restaurants where you're dining, but you could call them and ask.