Since you asked nice...
The only thing you can do, besides carbs, obviously, is use supps that will stimulate the thyroid but not the CNS.
Thermorexin has yohimbine which is too intense for a lot of people, including me. (Perhaps a yohimbe-free version?)
Acytl - L- taurine gets me going without the jitters, but mixed with yohimbe and I'm jumping out of my skin.
It's funny, because when the Protein Factory people were talking to me about supps for post cycle therepy, they asked about stuff for thyroid stimulation (I have a chapter in BLBB about it). But I don't think a supplement that doesn't get you jacked will no go over. Most people want that nervous surge.
Also try, kelp, selenium and thyroid extract, but the taurine may be your best bet.
Fuckhead. (Only kidding)