D., for years I've also been interested in growing morels as a mycorrhizal crop along with various trees including apples and cottonwoods in an orchard-like setting. I've been inoculating various trees here on my farm with various species of morels using primitive, non-sterile methods for the past several years. So far I've had limited success here, although at my girlfriend's farm, we had a real nice crop of morels in her garden last spring. They fruited right next to the
compost pile and underneath a madrone tree and a cedar stump where I had dumped a lot of morel spore slurry in the past.
In 2002, Stewart Craig Miller of Indiana did a bunch of research proving the symbiotic relationship between morels and various species of trees. He applied for and received a patent on his idea to grow morels in a tree plantation on the roots of elm and ash trees. His farm also used to sell inoculated trees, but I'm not sure if they still do. The website is here:
http://www.morelfarms.com/cultivation.html
There is a fairly good description on the website of how Miller grows morels on his farm, it's basically the same way truffles are grown in France, except he cuts the trees down to stimulate fruiting, it's very similar to your plan. Let me know what you think.