If I switch products or the rate of mix temporarily, I just create a new REGION, and then name it accordingly, like GLY/ATZ vs GLY, etc. It won't appear on the Insight map any differently (that I know of anyway), but you can see it later on SMS. Normally selecting a new REGION defaults to just a number change, but the little keyboard icon allows you to create a meaningful name. Also, if you press the Summary button on the RH side of the screen, you can see the acres of that field & renamed REGION. Your map will stay intact. But, if you change products, then you lose the map so far as I know. Also, changing the region will not allow product use summary accuracy.

Would changing the REGION & renaming it accordingly not work for you?