Good news! Unfortunately I’m not sold on having to have a bridge to access their email using Thinderbird, so I’m not subscribing Proton Unlimited “suite”. Also no working Linux client for Proton Drive (rclone’s is unmaintained and not working).

You’re mostly right – those names sound like overkill. However do note I have been using Bitwarden’s Name Generator (random noun + number) and I’ve evolved the scheme a bit ( it is now always ‘user’ and I keep adding numbers until the generated username is available ).