To unlock the game early via VPN:
1) Log out of the Steam mobile app and change your password via the the desktop client
1) Download and install
F-Secure Freedome (no hard limits, but the trial period expires after five days),
FlyVPN (20-minute session limit),
ProtonVPN (speed-limited),
TunnelBear (500MB data limit),
VPN Gate (no hard limits) or
VyprVPN (no hard limits, but remember to cancel within 72 hours)
3) Connect to a server in Australia, New Zealand or Asia
4) Restart Steam (if you're logged in)
5) Unlock the game
6, optional) Switch to Offline Mode to preserve the "Play" button as it will revert back to "Pre-load" once you're no longer connected to the VPN (even if you disconnect mid-game, you won't be booted out)
VPN Gate is preferable, assuming there's a relevant server available and the bandwidth is decent.
Note: The German Edition is a separate app and cannot be unlocked early.