Workshop "Smelting" into my app

I have users coming and logging in to a NextJS app I created. Within that NextJS app, I would love to embed (likely via iFrame) a workshop application for one “module.”

I am aware of the prerequisites here: https://www.palantir.com/docs/foundry/administration/embed-foundry-externally

Is there a way to embed the Workshop without requiring users to also log in to Foundry? Is there a way for their login into my application to suffice for the Foundry resources as well?

Trying to avoid having to make users “log in twice”

there should be the possibility to have public slate applications that dont require you to login at all… havent used them, though.
Also, you can add the offline_access scope for your Third party application to get a refresh token so people would not have to login multiple times in your nextjs app.
As far as I understand Foundry, accessing workshop internally or externally is not possible without authentication.

We do this the other way around (embed parts of a React app as Custom Widgets in Workshop). Our application uses Foundry for login, and the login is shared between workshop and the custom widgets using OSDK. Does your application use Foundry for login?