Dyllian Eggleston

Your enthusiasm is great, although I was merely saying what I know to be possible with coffee grounds and bio-char.
Mushroom cultivation has stages and procedures, for best results.
With the, "waste streams" you're capitalizing, I encourage you to look into Mycology more as it is quite a valuable skill-set for building soil.

Maybe go a different route, and use saprophytic mushroom to mycelliate it, then use the spent; hardened block, once it has fully dehydrated.
There's just so many specs (of coffee) it'd be hard to even know if it worked.