Combine the stock and claim juice. Heat just to a boil. Remove from heat and use this liquid to rehydrate the dried mushrooms. Reserve both the liquid and the rehydrated mushrooms separately
Cook the bacon in a large, heavy-bottomed pot. Remove when crisp and reserve
Add chicken to the pot and brown, then remove. Leave fat in the pan and cook down water if any remains from the chicken
If needed, add butter or oil to bring volume of fat in pan to ~1/4 cup
Sweat diced onion and celery in the fat until translucent, about 5 minutes
Add flour to make a roux. Mix thoroughly and allow to cook for a minute but do not brown the flour. If the mixture is dry, add some butter or oil
Slowly pour in the still-hot stock, 1 cup or so at a time, mixing thoroughly into the roux between each addition.
Return chicken and bacon to the pan. Add corn, peas, and carrots. Add nutmeg. Bring to a boil then simmer gently for 15 minutes.
Add shrimp, calamari, mushrooms, and cream. Simmer for 10-15 minutes more.
Taste and season.
Brush thick slices of milk bread with melted butter. Air-fry at 370 for 10-14 minutes total, flipping the bread at least once, to a crisp golden brown on both sides.
Using the tip of a sharp knife, cut a slit down each edge of one side of the bread, so that there's a square cut into it about 1/2 centimeter in from the crust.
Work the knife under this square along one side, then slide it further in until the entire square can be pried up like a coffin lid.
Fill with the chicken, mushroom, and seafood chowder made above
Close the lid of the "coffin" and serve