Oh yes please, they're delicious when you soak them in vinegar to deactivate the poison. And the tangy vinegar addition goes really nicely with the rest of the Wellington.
I don't know if this is intended as a joke, if yes this is in very poor taste.
Death cap mushrooms are incredibly dangerous and shouldn't even touch food containers or other food.
There is no safe way to consume death caps. They are the most common cause of human death by mushroom poisoning.