Do you have something like No Salt (found in the spice aisle of the grocery store) there in Australia? It's mainly potassium chloride. I have used it for 1/2 of the chloride in my salt pushes. Trying to stay a little more balanced with the potassium and sodium, when I do a salt push I'll use half No Salt and half Sea Salt .
(As a side question for those in the know, I've been wondering ... are the other minor ingredients in No Salt safe for us Iodinizers?)