I'm just a student and had trouble knowing the exactly question you are asking but I just did a case study on DKA so am kind of brushed up on the K+ shift..
It REALLY helped me back in pathophys to actually draw a blood vessel, a cell (circle), and write K+, Na+ etc
In hyperglycemia or low insulin, K+ shift goes into the cell at first so you have HYPOkalemia, when K+ is inside the cell.
So remember K+ is one of those electrolytes that is usually found the most in the intracellular fluid, more than extracellular.
So the total body potassium is not really changed.
Did I help at all haha? Maybe someone else could clarify.
ADD: This is informative! Hypokalemia and Hyperkalemia