Universal Login - alternative form

Weird question…..

We have a client that is using the Universal Interface for their application. Outside of the Universal interface we have a seperate page where clients can register themselves. This creates an IAM account that they can login with.

The client would like to integrate this registration form with the login form. The would mean we create a single page outside of the thinkwise application. On this page we have a regular form and a login form. Filling in the login form should result in opening universal and automatically login using the provided username/password. Is there a route to make this possible?