"I believe there is hope for the third tweeter."
Then invite him here! (Your previous invitee never showed up after registering.)
"Contrast this to the Turanists who are happy to claim steppe ancestry (and to add insult to injury claim this makes them "Aryan"), and are proud of the nomadic barbarism of Vedism."
These can never be ideologically converted, but at least you should persuade them to use the correct vocabulary ie. call themselves Turanian instead of "Aryan". This will make things clearer for future newcomers to the subject.