You are in the wrong place. Plenty of people here post pics speculating they have "leaf spot" if they see a lesion on a single grass blade and if the margin of the lesion looks a little gray then they think it's "gray leaf spot". On this board at least, it's over diagnosed.I think it has been misdiagnosed for years.
I have first hand experience with it but am curious about your claims. Why do you think it’s more widespread than everyone believes? Why do you say people are misdiagnosing it? Why do you think “conventional treatments” don’t work? Do you have first hand experience with it? Are you seeing it now?