Can't say 100% but I don't think this is possible.
What I will say though, is that I'm not sure it's a good idea. Since you'd be only actually sending a single email (instead of one email per recipient) you won't be able to clearly understand engagement, deliverability, etc. Everyone getting that same email will trigger a delivery, an open, a click, etc., PLUS you might right into mixing up cookie values that way too if a CC recipient clicks the link (which has the marketo token value in it for the primary recipient) so you'd now cookie the wrong person as the primary contact. To avoid that, you'd have to disable that, which just perpetuates your inability to understand how your prospects are engaging with your emails and website.
Sorry to be a downer, just some of my thoughts when seeing the question!
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