I always buy organic miso, Miso Master brand. Glad you think it's a good alternative. I add seaweed to it. I'm getting lots of iodine!
Yes, would be good to encourage children to do salt loading with good quality salt. We only ever had common table salt when I was growing up. Sometimes I wonder how I survived my early years of a crap diet!
Anyway, I haven't had a single headache with taking Lugol's even at higher doses, and feel very good generally, a bit fatigued sometimes, but it's not debilitating. Will keep up with the salt/miso.