I had the vanilla with vanilla buttercream too. I asked them if we could have milk for the champagne because it was early and we wouldn't be eating for a few hours, and in the Mid-west we like to toast with milk--it's and Indy 500 thing. They had delicious cold milk, and gave us the corked bottle of champagne for later.
You should call and talk to the manager GF Cafe at the restaurants. They probably have a policy/menu for things like your reception. I know the Yachtsman had it all figured out when I went in. I did a short trip down just to scout everything out. They were great. Everyone got to order an entree from a choice of five--two steaks, a fish, a chicken, or a vegetarian. They brought out dishes of four different sides for the tables and everyone had whatever they liked. They brought bread for the tables and everyone got to choose from a few deserts.
I bet CF Cafe would do something similar for you. It helps everyone. The restaurant knows what to expect and prepare so they can serve you better, the guests don't have to guess or worry about what to order or not order, because the menu is somewhat set, and you have at least an idea of what the cost will be. Either way that is a really nice venue, and perfect for your size party.
I chose 'Ohanna's for the rehearsal dinner because it is a single price for everyone's meal. It was easy to predict cost, order, and eat. Plus it was a great atmosphere.
Sanaa is more upscale and formal and will work well for a rehearsal dinner. It will be relaxed and and they have wonderfully exotic meals, which I'm sure you know. You should take a glass of wine out on the porch and sit and enjoy the bonfire they have at the AKL. With your size group it will be a wonderful way to relax before your big day.
Just remember to relax and have fun. I used to shoot wedding videos and I saw so many days ruined because brides, grooms, and mothers couldn't handle the smallest issues. Just enjoy the moment and realize your at WDW and all that really matters is your vows.