First, I think two weeks in is a little too soon to be worrying about fasting. It takes about 6-8 weeks for the body to start to become fat adapted and then a few more months after that to become completely fat adapted.
Radically changing your diet and your body’s energy source can be stressful. I would suggest don’t stress. Eat your 20 grams of carbs a day, and give your body a chance to adapt. Once you are fat adapted, you may find you fall into an intermittent fasting pattern naturally. Eat when hungry and don’t eat when you are not hungry. Listen to your signals. Forcing fasting mostly likely will result in overeating especially during the early adaptation phase.
In addition, if you are making ketones at 0.5 mmol/l (or whatever the units are) then you are in ketosis even if your blood sugar levels are a little higher than expected. Under stress your body releases glucose from the liver to handle whatever is causing the stress. The other time the liver releases glucose is early in the morning. It is a natural process. An early morning release of cortisol causes the liver to release glucose to prepare us for the start of the day. It is called the dawn phenomenon. The dawn phenomenon tends to be a little higher in people with type 2 diabetes. Again, if you have 0.6 or 0.7 ketone measurements, you are burning fat.
I guess it boils down to “Let go and let Keto”. Your body it making a lot of adjustments right now. Give it a chance to work through all the changes with as little stress as possible.