You can absolutely have a few pints of beer, etc., from time to time. And if you’re fat-adapted and take care to stay fat-adapted, the effects of those occasional treats will have less problematic effects on your body.
Please don’t take what I’m about to say as any sort of judgement or like I’m implying you don’t know stuff, I really don’t mean it like that and only hope this helps. But I am guessing, based on your thinking about going not only off keto but to a low fat, low calorie diet, that you haven’t really been exposed to or convinced by the scientific data showing both the ineffectiveness and the deleterious effects of this typical diet approach. Has it ever worked for you before for a long period of time? I really try not to be dogmatic about keto, but most of us who have read/watched/self-educated about the science would run away screaming as far and fast as possible from low fat/low calories. This includes the members of this forum who believe more strongly in CICO than others.
You’ve come so far, and as someone who had to start keto three times to finally commit for life to a low carb lifestyle, I can totally sympathize with how you’re feeling. But I can also tell you, it’s no fun watching your progress blow away in the wind. I also have not had the same rapid results since coming back, it has been a longer slog. My only real suggestion would be to do whatever you can to dig into the science and understand the nature of those lab values and other issues you’re having (including making it enjoyable) before you reverse your hard-won fat-adapatation. There are lots of different ideas for breaking stalls out there, different things work for different people. If you still want to switch to low fat and low calorie after all your research, the option will still be there. I wish you luck!