Well, Its a nice idea, but no, it does not work according to this article: (Iodine is lost from salt within 6 months.) https://farmfreshforlife.com/iodized-salt-is-it-enough/ Also, if you eat a lot of Cruciferous vegetables something fills up the iodine receptor sites in your thyroid and you get goiter, so you need to lay off the broccoli and cabbage occasionally! https://www.mindfulnutritionsolutions.com/iodine-thyroid-cruciferous-vegetables
Interesting about the cruciferous vegetables. Our mainstay. Kale growing like mad right now. WIll have to eat other other kinds too.