Hi Jacob!
Thanks for getting in touch with us! That seems like an interesting customization.
First, please let me note that we are fairly limited in how much support we can give for custom development questions like that.
That said, we always like helping out and at least point users into the right direction as much possible.
The attendee information for a ticket is stored in a cookie throughout the cart and payment process. You can find the code that handles this in /wp-content/plugins/event-tickets/plus/src/Tribe/Meta.php
I hope that helps. Let me know if any follow up questions.
Best,
Victor