The Lucky Nugget is only open for full meals for the character lunch buffet from 12 noon to 3pm each day.
Rendezvous des Stars is often only open until late afternoon, and I suspect Walts will only be open for advance bookings for meals until possibly 5pm or so. If you are going to DLRP within the next 60 days, you could phone the Dining reservation number now, and they'd be able to tell you the last sittings you could book for at each of your preferred restaurants.
We had half board plus on our last visit, only used them in the Village and hotel restaurants, and honestly, were spoiled for choice.
Parkside diner at HNY, Cape Cod at the NBC, and both restaurants at Sequoia Lodge are on the HB plus plan. Plus La Grange at Billy Bobs in the Village, the Steakhouse in the Village, and you can use your vouchers at face value in Cafe Mickey, and have a minimal amount to pay on the bill there

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