Some people need to eat 3 times a day; it is fine. You just do whatever your body needs. I watched a video really early on in my Keto walk, (before I found this lovely forum) that talked about trying to at least do 12:12 -so after your dinner, try to wait at least 12 hours again before consuming any calories (so you could still have herbal tea in the evenings, just nothing with calories). That is still doing an IF but you would be sleeping for most of it =).
Personally I do 20:4 now, eating lunch at 1pm and supper at 4:30 but I am a stay at home mom/grandma and you are doing very busy physical work so there is a big difference! I think you are burning a lot of calories with all the work you are doing as well, and I can totally see why you would do well having the bacon, eggs and fatty coffee in the morning! That totally makes sense =).
I would try the three meals a day, with no snacks between, with a 12:12 window, combined with eliminating the sugar substitutes. I stopped using them as well in June as I felt they were making me bloat, cause stalls, and also made me have cravings (that I didn’t give into but still had them, and eliminating them helped the cravings disappear). Best wishes in getting the scales moving again!! =).