Not a dry fasting expert, but I will give you my experience. I’ve gone down the same rabbit hole (keto, Berg, Fung). I just completed a 6 day dry fast and generally thought it was easier than a water fast. I was stalling with the water fasts and this definitely broke the stall. I consistently lost 2 lbs every day (I’m assuming your a woman - I’m a guy so maybe a little bit easier for me to loose). The only time I was thirsty was when I worked out. They say you shouldn’t go from water fast to dry fast because you may deplete electrolytes, but I actually drank water for the 1st 12 hours and took some electrolytes then started the dry fast (because I hadn’t decided on the dry fast until I was already fasting). I’m going continue doing this because I’ve read you can get constipated on a dry fast and this way you at least start things off not being constipated.
1.4kg a day and if you have fat then you can fast
Id stop at 10kg bodyfat though. No real reason to go lower and fat is important for thermoregulation and hormone production as well as for acting as a reserve in case of sickness.
To make fat loss progress 5 days are a minimum and refeed days (meaning first 3 days after a fast) should have a minimum of carbs.
You can verify this yourself with a blood glucose tester and a bioimpedance bodyfat testing weight scale.