I'm not sure how the aclohol tec would work with the peatmoss, but from the grain-based mycelium only I don't see why it shouldn't. The only problem I see is that it's not dry matter so you will have lots of volume, which can complicate stuff. Means you will probably have to work with more liquid than is entirely handy...
Lemon-tek does indeed work pretty well but I'm not sure it can be stored as well as crystals.
I suggest you make a variation of the alcohol tek you posted to, from shroomology, and try it. Since you are growing you will probably have more than one tub to test it on. I would try to separate the peatmoss, since I don't think I would like ingesting it, but I guess you can also filter and clean up your product later.
I've done one mushroom extraction and it was a mess, because the crystals attracted lots of moisture when I left them to evap and turned very gooey. I never ended up trying them. Probably the easiest form of handling them once extracted is making a tincture.
Buon viso a cattivo gioco!
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energy conserving caapi extraction