I found a way to edit the database - at first, I tried direct /var/private/db/auth.db
sqlite modifications, but it didn't work, so after some time I managed to do this easier than I thought I will:
security authorizationdb read system.login.console > outfile.plist
After this, you need to modify the resulting outfile.plist
as it's said in the NullAuthPlugin readme:
<key>mechanisms</key>
<array>
<string>NameAndPassword:invoke</string>
(the last line is the one you need to add to the file).
Then, to save it to the database:
security authorizationdb write system.login.console < outfile.plist
Then the changes should be visible on any login/lock screen of your system, but be careful!
You will not be able to authenticate with current version of NameAndPassword example!
Be sure to estabilish a working SSH connection to your Mac before you modify the database, so you will be able to revert the changes using other device (just repeat the db modification process but this time remove the line you added before).
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