You're not really going to get around having to install "something" to sync your passwords if you want to have your passwords synced
You could use something like Syncthing if you just don't want to trust any company with your data
Otherwise, I cant really suggest a solution either
Sorry, I hope it's clear now.
> You're not really going to get around having to install "something" to sync your passwords if you want to have your passwords synced
Huh? This is obviously wrong; I'm doing literally this with KeePass. I haven't installed anything, and it has a plugin to sync directly with Google Drive that doesn't mess with or care about anything in the rest of the system.
Additionally, I was not personally aware of any way to "sync directly" other than using the Google Drive desktop client (https://www.google.com/drive/download/) and storing the database file in the synced folder. It sounds like you're saying Keepass has some direct integration with Google Drive?
All of that said, I am really not invested in this issue - I use multiple cloud sync services and it doesn't bother me.
Indeed it has a plugin for this, yeah. That's exactly what I'm saying. https://sourceforge.net/projects/kp-googlesync/
I created a keepass/syncthing directory somewhere inside my home directory, and I told Syncthing to sync only that directory. And the directory only contains the Keepass database plus a few Syncthing log files and such.