Add new member to specific subscription upon registration (skip manual subscription page)

Hi

I am running a site with Membership and Buddypress

We would like to have a special registration form that automatically adds a new user to a specific subscription (without them needing to manually select the subscription after registering).

The current flow is:
registration form > subscription form > welcome page

We would like:
registration form > welcome page

We could pass the relevant subscription to the registration form via a URL parameter or write it into the page has a hidden form variable.

Is this possible? For our situation where we don't have multiple subscriptions to choose from, the subscription step seems unnecessary and actually confuses many of our users (they often neglect to click the subscription button thinking they have already completed their registration).