Hi there Nicholas,
I would probably visit Downtown Disney after V&A's. It might be fun to stroll around all dressed up and you could even add a ride on Characters in Flight to your itinerary! This is a hot air balloon experience that will send you floating high above Walt Disney World with incredible views!
You could also get dropped off at Port Orleans Riverside afterwards where you could take a romantic carriage ride around the beautiful property. Afterwards, you can board a boat which will deliver you to Downtown Disney via a relaxing ride along the Sassagoula River!
Another option that came to mind would be booking a
special fireworks cruise after V&A's. You could board your private boat right at the Grand Floridian Marina and you could arrange for Champagne and desserts on board if you choose! This special excursion will ensure you are situated right in the middle of the Seven Seas Lagoon to watch the Magic Kingdom's Fireworks.
Since you're already planning to dine at Narcoossee's the experience of watching the fireworks and Electrical Water Pageant from that location might be redundant if you do it again on Sunday.
Please keep the questions coming!
-Amanda F.