I would have to look into morel kits.....You may be able to find the "inoculant" to add to a bed.
My are wild and seem to grow around dead elms......?
But although you may find them is roughly the same area...not always in the same spot.
It's one of those things...."Where are they growing...this year?"
Building a bed is an interesting idea.
Let use know how that works for you.....
In the past I have used the spread compost, old potting soil...from house plants that are depleted and repotted.......and wood stove ashes....
Don't use too many ashes as my soil is mostly a clay loam and tend to be alkaline..as are ashes......
Dark anything does really helps to clear off the snow and warm the soil.
Used to place black garbage bags of leaves...on the pea patch......and the area I planned for lettuce and radishes.
Seemed to help as well.
I don't think we really had deep frost this year...just a lot of mud in the till part of the garden...
Even the lawn took a beating with the dogs.
Spread chopped straw, with grass seed and then some sand over that.....helps keep the dogs feet less muddy...(and feeds the birds...LOL)