The 50s PTC isn't currently an option, which is a shame as I think it would be great for your party. They are currently running fixed price menus as follows (from Deb Wills' site):
Brown Derby $36.99 adult/$9.99 child (3-11) not including admission, tax, and gratuity. Child's meal includes beverage and dessert. Your choice of appetizer, soup, or salad; entree; and dessert from menu. Items include Spice Grilled Filet Mignon, Pan-Seared Grouper, and The Original Cobb Salad. Alcoholic beverages NOT included.
Mama Melrose $28.99 adult/$9.99 child (3-11) not including admission, tax, and gratuity. Child's meal includes beverage and dessert. Your choice of one wood-fired Flatbread to share from Mama's rustic on-stage kitchen, as well as family style salad, and choice of entrees featuring Linguine Fra Diavolo, Oven Baked Stuffed Chicken Breast, and Char Grilled Filet Mignon with Gorgonzola Butter. Dessert: Mama's signature Fantasmic! Tiramisu. Alcoholic beverages NOT included.
Hollywood & Vine $21.99 adult/$10.99 child (3-11) not including admission, tax, and gratuity (no characters) Child's meal includes beverage. All you care to eat buffet. Choose from a number of selections including; oven-roasted Prime Rib, Citrus Baked Chicken, Pan-seared Salmon, and Stir-Fry Noodles with Sesame. Also includes fresh salads and build your own ice cream/dessert bar. Alcoholic beverages NOT included.
I would recommend getting a really early PS. Even with the reserved seating you have to show up at least 30 minutes before showtime. I'd hate to be stressed over dinner thinking I wasn't going to make it. My preference would be to eat as early as possible and then to do some other things around the park until it was time to arrive.