I remember.... it was a guy named Nic in either Tasmania or New Zealand. Deceased, sad to say. But he continually posted on the old OLD (precursor to OGD) about his great success growing Cymbidiums in straight horse manure. I don't even think he composted it. As for worm castings...don't they raise the pH?
The problem with teas is you may run into micro nutrient problems. You'll have to use Ca/Mg supplement. In soil environments, You can add lime or other sorts of Ca/Mg supplements that break down over time. Very hard to do with plants in very course mix or on mounts.
