Question: Why would blood glucose go up on a low-carb diet?

When you're adapted to low insulin levels with lower GLUT expression, but you want to get glucose into muscle, you're going to need higher blood glucose levels to do it. I think elevated blood glucose is sufficiently known to be pathological that it would be unwise to assume the sort of more generous interpretation of that as a physiological response. I think it would be a much better approach to do what you need to do to get your blood glucose levels into the healthy range. Otherwise, I think it's quite a gamble to presume innocence of that elevated blood glucose.

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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.

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