Hey, Sarah. Should I take it that you are again considering the Anabolic/Metabolic Diet? Regardless, fat adaptation is, more or less, all or nothing. And the process of becoming fat adapted can be a bit stressful (something I know you know a little about).
As far as whether one can be protein adapted, the answer is yes. From my own experience, I can say that I have been protein adapted before. EXTREME fatigue, odd weight fluctuations, and rapidly atrophying muscles when I cut workout frequency (which I inevitably have to do due to poor recovery).
You ask good questions, Sarah... and you also tend to get fantastic answers. Consider a two week trial run of the advice that you are given. Yes, it may be difficult, and YES, you may experience some unpleasant body comp fluctuations... but they are all TEMPORARY. I assure you. I've been through it myself.
Goodluck and keep it up.