Personally, I like the reading materials at www.fungi.com
They do offer a myco-mix that they say have been researched to be beneficially symbiotic with vegetables/garden plants but I have no experience using it.
Another great fungi/myco resource (and sorry these are both in USA but possibly may ship to Canada considering their locations) is www.fieldforest.net
Good luck and please keep us posted on what you decide to use and details on how you are going about it. I'm very interested.
Oh, and so far, I've only intentionally tried spreading spent oyster and shiitake mushroom spawn in the raised bed mix and/or incorporating it in the compost pile. Neither of these processes were intended to grow the oyster mushrooms in the bed as symbiotic source (that's a whole another project that you can read about at fungi.com).
I also regularly add what is sold as "mushroom compost" -- spent mushroom compost from the mushroom industry. There are some pros and cons including likely use of pesticides if the source is not an organic farm.
In addition, many higher end potting mixes now contain mycorrhizae so I imagine when I use them to uppot transplants, they get introduced into the garden beds as well.
Since I use fungi-promoting fall leaves, sticks, branches, hay, straw, cardboard, etc., my garden beds all sport some kind of naturally introduced fungi/mushrooms. This is typical, and you may see this happen in your garden bed at some point too.
Ha! I keep thinking of new things to add to this post!
I think Fava beans as cover crop is a great idea. Make sure to cut the stems at ground level after harvesting and leave the roots and their N-containing rhizobium nodules in the ground to break down and release. As some have commented, this all sounds like makings of a very rich (i.e. Nitrogen-rich) mix. It will probably be a good idea to give some thought into WHICH crops you will want to plant in this bed in spring.