The problem with long random fasting is that you can put you body into famine mode then just rebound with more weight when you start eating again. Unless your body is good at slipping into ketosis. I'm actually hearing more and more doctors and researchers saying you're better off doing it as intermittent fasting by just extending your sleeping fast. Having a cut off with meals a few hours before bed and not having breakfast as soon as you get up, but leaving it until a bit later. It likely won't help that you do shift work which upsets your circadian rhythm.
Keto can be a wide range of foods, by the way, if you are happy to include plant foods. I'm currently just moving away from the ultra refined foods and trying not to go ham on carb rich foods too much. Also adding in more protein, which is more satiating. There was a study done on increasing protein intake for people wanting to lose weight and changing nothing else. They all lost weight just doing that. I'm not sure what the best recommendations are for men, but at least 2 grams of protein per kilo of target body weight per day, possibly more. For me it's around 2.4, so I'd assume at least the same for men?
On a side note, I'm obviously not doing this to lose weight rather to improve my health because I'm sick and tired of feeling sick and tired. The side effects seem to be that I have lost a bit from my waste, but my weight hasn't changed so I'm likely replacing it with muscle. I've noticed I've not been getting blood sugar crashes at climbing any more as well.
Glad it's working out well for you. Thanks for sharing :)