I want to do that but I have such shitty memory that I will forget the passphrase at some point. It happened to me at least twice…

I really love all the 5+ years old articles about why systemd sucks.
It’s not perfect but it’s so much better than the plethora of different init methods Linux used to have. Also managing sysv init scripts sucked really bad.
It’s lightweight, most of it is optional, it’s declarative, it makes managing your systems much easier and it just works.