Hi David,
Thanks for going Pro and welcome to the forums!
I can try to help out here, but I am limited in supporting customizations.
Per our terms and conditions we support features of the plugins and although we try to help get you started on customizations for the most part you are going to have to take it on to complete.
I’m not sure whether you can capture the data using a hook. More likely you will need to look into capturing the data on a form submit and then saving it to a session variable.
If you need some expert help, I can recommend you some freelancers who are not affiliated with us and I’m sure they would be happy to help out.
Let me know if this gets you started.
Cheers,
Andras