Allow user to choose profile AND register with Facebook?

Hello, again,

Can someone help me understand if the following is possible... Here's the workflow I would like to see:

1. User clicks "register" button
2. User see the "Select Profile Type" screen, where he can choose a profile
3. User clicks the "Join Now" button associated with the profile.
4. On the next screen (step 1 of the reg process) there would be a button at the top to " Sign Up with Facebook"

Is this possible? In other words, is it possible to allow the user to choose a profile AND sign up with Facebook? I can't figure out how to make this work...

I REALLY want to force the user to choose a profile, but don't want to sacrifice the benefits the user (and site) get from registration via Facebook.

Thanks in advance!