Good article!
I just thought I'd tell you how I corrected my underactive thyroid - it's been in decent shape for the past 8 years after being told 16 years ago that it would be a lifetime condition... (I also found that the levothyroxine was a chronic fatigue trigger for me - so I really had to get off that! The natural versions weren't an option when I was in the UK.) So, I will share what I did.

#1 - know your body temp! Your first-thing-in-the-morning temp is a HUGE indicator of your thyroid health. If it's under 98F, your thyroid cannot function correctly. I am happy if my first temp is around 97.7 because I know it will reach 98 fairly quickly. But before I started self-treating, it was around 97.3 - WAY too low and almost a dead giveaway that the thyroid wasn't working correctly.

#2 - stop attacking the thyroid with diet! I know you're not doing it deliberately, but there are many parts of the modern diet that negatively affect the thyroid and suppress the body temp. Did you know that chlorine, fluoride and bromine all compete with iodine in your thyroid? These things suppress its function. Soy suppresses the thyroid and body temp too. Personally, I also find that corn sweeteners (glucose syrup, dextrose, maltodextrin, etc) can suppress my temp for a day or two.

#3 - support the thyroid. I do this with iodine supplementation at a therapeutic dose (I think I found that to be around 9-10 x the normal supplemental dose, but you'd have to double check as it's been a long time since I looked it up. Sea kelp is another good source of natural iodine - you can get these little granules that you use like salt. When supplementing, you have to be aware of the symptoms of hyperthyroid, but it sounds like you've got that one covered!

I really need to write an article about this!

Anyway, good luck!