You have read the entire book, so you have an inkling about what Hesse was trying to say. The question you ask are beautiful questions, they show you are thinking, they show you are sincere, that you are not prepared to live a lie, they also show that you are one that will never be content walking the middle line, but how do we survive without going mad.
You know the answer, it is humour, and acceptance, both in line with Gurbani, Chardi Kala and tera bhana meetha lage, I have a simple rule about Bani, I only read what I am prepared to contemplate and practice, anything else, is in my opinion a waste of time, reading for the sake of reading, reciting for the sake of reciting, empty practices in my view.
A rehat should not be held on to, that implies lack of understanding, you are squeezing too hard, relax, let the rehat guide you, not own you. Consider that the rehat is man made and the Bani is Guru made, draw your own conclusions from that..
If rehat is describing how one should feel when is in love, then following rehat will not automatically act as a love potion. First fall in love, with Creation, make a difference, think, contemplate, act, and then you may find you fall in line with rehat, not through obedience, but through love and wanting to.
My opinion only, hope it helps
No prospect was more hateful and distasteful to him than that he should have to go to an office and conform to daily and yearly routine and obey others. "
Yes, I love this line, it is engraved on my heart, it brings to mind the complete futility of any ritual, ie, actions done for the sake of doing the action without any underlying reason, in the hope that divine blessings will follow.