One step ahead - installed Syncthing on an always-on Windows box located at my office, pointed it at some needed Google Drive folders, and synced to Debian. The Windows box has other syncing tasks anyway so it’s not costing anything in power. The Debian laptop is becoming my main workhorse.

rclone is too much of a PITA to configure.
insync is way too expensive, especially with multiple Google Drive accounts.
Gnome’s sync thinggie does weird stuff with filenames in LibreOffice etc, is basically unusable.

I need Google Drive due to my existing business setups.