Rafa Yadein
We can classify as an optional action. There’s no such thing as a fard sunnah and a non-fard sunnah. Certain mandatory actions, such as Juma prayer, will become fard under certain circumstances.
Please let me know if I’ve misunderstood- this topic is really confusing and has so many nuances
You have, but given the limitations of this platform I have done my best to explain it to you. The next best thing you can do is to get in touch with Sajid Hameed sahab. He explains this concept really well, and has already done it dozens of times for his students. Sajid sahab has a study circle every Saturday night followed by a Q&A session that you might want to attend.