I was on a LCHF diet for about 18 or so months measuring my ketones daily with a NovaMax meter (blood). I also was doing a lot of endurance type activities. I also monitored glucose levels but not as closely.

My interest was finding the maximum carbohydrates (type and quantity) that I could process during exercise and still remain in ketosis. I found that when I was in ketosis and fat adapted, it was virtually impossible for me to bonk even without eating. I could also eat more carbs during exercise and remain in ketosis than when in couch potato mode. I have no idea if a low carb high fat diet would work for a diabetic, it might be something to discuss with an open minded MD. The study that I link below.....those on LCHF either went off insulin or greatly reduced.

Most of the foods that hikers eat are begging for an insulin resistance problem of some sort.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7103851/