The password managers are: KeepassDX (Far Left), KeepassXC (PC version of local), Proton Pass (Better privacy) and Bitwarden (Far Right). Please note that bitwarden does some data collection. See their privacy policy here and their privacy spy rating here.
Great system you have there. Yeah, places like work, that makes you switch often (witch is also a security risk in some ways), can be a problem. But they might have their own system added. You say every 3 months, and I’d probably put the season on the password then - like winter, spring, summer and fall…
Thanks for sharing some common sense here.