Unfortunately, changing associated Google Accounts is not easy.

However you can invite other Google Accounts, including another that you use - to allow multiple users to access a single A2X account. 

From the settings section of your account, Users can be invited or removed, see the screenshot below.  Go to Settings, and then choose Users.

 Below is a screenshot of the User management interface

Addendum: If you are the Admin, you can also switch Admin to the account with the blue button, as above.

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