I must admit I haven't read every word on your thread Neo, but I'm going to pitch in anyway.
You obviously exercise several times a day, but I'm not sure I can fathom what that entails. Do you use a multi-gym, stepper, rower, treadmill or other things?
I see you have experienced what you feel are low blood scores. Do you feel unwell when your scores read low, or do the numbers scare you because they are less than 4? If you feel unwell, what do you feel, and what have you done about it, up until now? Without knowing what your workout entails, I can't have a view on how hard that might be on the very low calorie diet, but I do want to comment on your numbers.
Please don't be freaked out by your numbers because they are below 4. Many, many non-diabetic people, and some diabetics routinely see numbers in the 3s and are absolutely fine. I am one of those people. I am diabetic, but my numbers have moderated to such an extent my readings are pretty much at the lower end of the scale, almost always. For instance, I didn't actually see any 4s yesterday. I had a fairly low carb day, which wasn't necessarily hugely planned, I just didn't eat much carb. I seemed to surf at 3.5 - 3.9 throughout the day, and felt fine. I was active, doing gardening, washing my car and a few other active, if not heavily strenuous activities. I only start to feel a bit empty at 3.4.
I don't take any meds, so I have nothing driving my levels down. Maybe you will be someone like me, in that regard?
When I have found myself feeling empty, if food is imminent, I just wait for it. If I'm not due to eat, I would probably have a cup of tea, with milk, which just nudges me up a little, and I get on with my day. I have never, ever taken anything carby to treat a low. I just don't need it. If you don't feel well at those levels, that's different.
So, I just wanted to throw the contra view into the mix for discussion.
Finally, I didn't do the Newcastle Diet, nor did I heavily low carb, but I did reduce my carbs. When my bloods were moderating, and I was losing weight, I was swimming every day, sailing, diving, cycling and regularly walking the golf course, so although not working out 3 or 4 times a day, I was significantly active.
I hope you find a way forward. It looks like your bloods want to go low, so go luck with that.