Seriously, the neofriend thing is the safest way. One of my accounts was friend with my ab account. But that was it, I didn't take the time to neofriend all my accounts.
I got chain iced, like 5~ accounts gone. But the one who was friend with my ab account didn't get anything. Even if I was abing on it (not very often but still) and transferring items like a cow (neofriend gift)