Routes outside SSO for Embedding into Salesforce?

So I see all the extensive examples and discussion around using SSO for Looker Embedded into Salesforce but what do you do if you do not have every Salesforce User a license with Looker. Can we authenticate and display based on admin user that is not the running user on the Salesforce page? I feel like I came across this but cannot currently find this. Thank you in advance.

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