Saving local village over Google+ village

Solution 1:

Unfortunately, this is not possible. The link is done on the SuperCell servers, and there's no way to unlink an account from a Google+ (Android) or Game Center account (iOS).

You will need to create a new Google+ account to link to your village.

Just FYI, there's some information I found on Google that suggests you can unlink it by going into Google+ settings. I just tried these suggestions with a test village of mine and can co firm that process doesn't work.

Solution 2:

Yes, you can remove your old town hall from your Google account.

1. Open your Android device, of course.
2. Open Google Settings.
3. Open Connected Apps then tap to Clash of Clans.
4. Tap to Disconnect to remove this game from your account.
5. Done.