I use syncthing. Mostly for syncing all my music and pictures between phone / laptop and home server. For your use case, there is a solution with the caveat t

I use syncthing. Mostly for syncing all my music and pictures between phone / laptop and home server. For your use case, there is a solution with the caveat that your password manager is unavailable on the flight. Simply have a dumb phone on entry with Syncthing and your Password manager installed but no password file. Once you have been allowed entry into the despotic regime's lands, connect to a starbucks wifi, initiate syncthing and it will pull your password file from your home server / computer etc. If you update your password file, it will be synced back to your home server. When you travel again, disable syncthing, delete your password manager. Or use an ssh script to pull it from your home server.