Shuck the oysters and strain the liquor through a fine mesh sieve. Reserve oysters and liquid separately.
In a saute pan, add the butter and heat until bubbling. Add the leeks, onions, shallots, and thyme and cook until transparent. In a separate large saucepan over medium-high heat, add the bacon and cook until crisp. Lower the heat, add the flour and cook the "roux" for 5 to 6 minutes. Add the fish stock, clam juice, oyster liquor, white wine, potatoes, and Virginia ham. Raise heat to high and bring to a simmer. Add the cooked leek-onion mixture and reduce all by 1/4. Add the corn and cook for 4 minutes. Add the cream, sherry, and hot sauce and cook 4 more minutes, stirring so as not to scorch. Add the rockfish, crabmeat and oysters and cook a minute or two. Check salt and pepper, noting that the ham is very salty so the chowder won't need much.
Serve in 6 warm soup terrines and garnish with the chopped chives. Serve with corn breadsticks or common crackers.