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I'd suggest making the follow up page to the form, a very similar-looking page, but instead of the form with just email address and submit, then you have the follow up form that requests their additional information.
Just note, nothing will require them to fill out the second form, so you might have people dropping off after the first form fillout.
We had success in implementing something very similar. We created a custom Marketo form, which had many fields, including radio buttons. When the user clicked on Submit, another Marketo form opened in a pop-up on the same page with more fields.
This pop-up form had 2 different submit buttons and each button was associated with a different Thanks page.
So, it was a custom Marketo form, with another Marketo form in a pop-up on same landing page, and then 2 different thanks page.
Drop me a line at email@example.com and I can show you the demo for this.