I don't see why the leaf couldn't be used. I have made tea from just the leaf, and it produced the same effect as Harmalas always have for me. I don't know if it was enough to activate dmt, but I could definitely feel the harmalas.
As far as the taste, it's not bad. Brewed as is, with no added acids like vinegar, and you actually have a decent tea.
Everything published by Gone-and-Back are the mad rantings and ravings of a mind who yearns to be free and thinks he knows what he is talking about. However, these are just delusions made to feel that freedom, because that freedom will never come. Any experiments done are purely figments of the imagination, and are falsified to the highest degree. Nothing should be taken seriously from a crazy mans mind.