As a practical solution, I wonder if you could provide the reviewers with a fake id that you hardcode into the backend for test accounts. Whcih could allow them to use the same login UI (even if the underlying codepath is different)
The ID login flow is basically UI-less. The user taps the login button, a separate identification app (that basically all swedes have) is launched, and as soon as the authentication is completed the user is navigated to the logged in view. It's a very seamless experience, and a lot of swedish apps work this way.
On the other hand it means that it's impossible to determine which user is logging in until the proper auth is complete. And thus you cannot have "special accounts" using this flow.
