Multiple Inboxes For One User

I am trying to understand the best way to manage multiple domains and inboxes within a single Workspace account. I have a Workspace in which users are under one company user@company1.com  or  user@company2.com which is easy enough, but the owner wants to have both emails as separate inboxes (not aliased.) Is there a way to do this in which he can have a single identity for both? I looked at group mailboxes and delegated access and both didn't seem the right fit. I can set up two users with the same password, but that doesn't seem best practice from a security standpoint. 

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