This doesn't work for everyone. I have DP which extends to noon or later at times. I start each day with coffee, cream and butter so minimal carbs. Despite this my BG still climbs. If I exercise, especially multiple hours on a bicycle, the BG can go even higher and faster. I'm still trying to explain this, but I suspect that when I start to exercise my liver releases glucose (as expected). However when I am keto adapted I am not burning glucose, but burning ketones, so the glucose tends to hang around instead of being burned off. I suspect that there is some sort of abnormal glucagon response going on which is encouraging the release of glucose from the liver but inhibiting the release of insulin from the pancreas. After noon the insulin seems to kick in and my BG then comes back down again more or less as one would expect. I must say that I'm not convinced that a square of cheese would halt a liver dump in my case. As a general point I think that the glucose/insulin response is different when you are fully keto adapted and not using glucose as your primary fuel source.