In my opinion you are overreacting a little bit.
first of all, all the things that you are assuming is going to happen only "if the bitcoin will be worth a lot of money one day (a lot is somewhere around 10K USD per BTC)" which if you ask me, is not going to happen.
second of all, you are saying "People could physically threaten you or your family, attack your house, or perhaps hack you."
the threat is the same amount if you are rich (have a lot of fiat $$$) now. i don't see why there can be any difference between being rich with fiat or being rich by having bitcoin!
i feel like your whole process of securing your bitcoins is a bit extreme with a lot of unnecessary steps, it can be easier but if it makes you feel safe never do even one step less.
I think you are right in that I may be over reacting a bit.
I just don't want to be sorry that I didn't do enough. I find the the security part interesting and fun too.