EXACTLY! So typical, the guys just lost in his own little world, while this incredible woman has stood by him for a decade, being supportive of all his wants and hobbies, caring for him, and bending over backwards to keep up an aesthetic he finds appealing even if it means dark magics! Suddenly the veil slips a little and ten years of dedication go out the window and suddenly he is terrified even though she has never given him any evidence other than that of devotion to him!

I think you are spot on, maybe he could try learning the late night chant in secret, and suprising her by joining her, potentially shaving his head too in solidarity. Genuinely cant think of a more romantic gesture.