Bread was said to be used about a century ago. In theory, it would be good. Try different nutrients in different places. To start the mycelium, use spores. Morel spores germinate rapidly, unlike other mushroom spores, which have to survive through the winter.
Morels survive through the winter as sclerotia, which is the equivalent of underground spores.
The spores come from fresh or dried morels. But the morels have to have aged somewhat, because it takes 3 days for spores to form. Rapidly dried morels usually do not have spores. Dried morels will have a dusty appearance when spores are present, though there will sometimes be spores where they do not look dusty. Usually, dried morels sold for food have some spores.