add Google account to database directly?

I'm looking for a way to add a Google account directly to the account database.
I don't want verification of the account if possible

Basically I have an offline device that has no access to the internet and wish to run a app that will not run unless there is a account on the device.
(But I can't add an account unless it's connected to the internet even though the app will run just fine if it never gets internet it needs the account there)
(Yes I have offline devices just for things that have no need for internet)

I'm moderately skilled with most things but not fantastic so easier the better.

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