Since this is an embed code, there are already limitations here and on top of that, very few of our merchants are cookie'd.
There are a few ways in terms of logic I feel like this could be implemented, but I'm not sure how to go about doing so within the limitations of Marketo itself:
1) If SFDC Type = Contact, route them to another page
2) If email address is within a smartlist that has all of our active customer emails on it, route them to another page
Has anyone done something similar?
Yes, this would need to be done via API or hidden fields that are pre populated, as I don;t think the form data would be processed fast enough to make the transition in real time.