Everybody runs their prep differently and carb reactions differ. Personally, there is no way in hell I'd run carbs that low for a whole prep. You'd be pretty miserable and flat. My preps start with my carbs as high as possible while I am losing a scheduled amount of weight per week. The first 6-8 weeks of prep are pretty "easy" as far as diet goes for me. I typically do 3 LOW days and a HIGH day on the 4th day. As the prep progresses, the total carbs for each day drop over time. My last 6-7 weeks for my last show I ran 82g of cars on my low days and around 300ish on high days. I don't have cheat meals because my body tends to hold on them a little longer than my coach would like.
I feel like you staying low the whole time without refeeds or cheats will spell doom for your metabolism, thyroid, ability to hold muscle, and endurance. Prep is never easy, but there are definitely ways to make it easier. I definitely suggest refeeds or cheats to keep the system going in a higher gear.
The best thing to do is learn what works for your body.