This is the situation I’m in. Half-a-dozen clients in the energy and automotive industries, each with multiple security regimes and short timeouts. Passwords mutate with time and I stay sane…
I don’t like to keep any security stuff in “the cloud”, written down anywhere, or even on my own devices. It’s too easy to lose everything after one security breach.
Instead, I use password algorithms seeded from both the service name/identifier and one or more private passwords. This lets me keep thousands of service/site unique passwords in my head just by memorizing twenty or so words.
Imagine how amazing the PR would have been if the title had been: “User gets spectator seating for a SpaceX launch in return for lost handle”