Hi Simon (Spancer?),
Thanks for reaching out to us here on the support forum.
So unfortunately that will require a developer to hop in and create this behavior for you, I can say it’s possible by using Hooks and Filter from WooCommerce and from our Plugins, but we here don’t offer development for this kind of modification because it would require too much time from our team.
We can offer you a list of Developers that you can Hire to accomplish that job, you only need to email to <b>[email protected]</b>, and a person will email you back with a list of WordPress developers that have the knowledge to do it.
Unless you have a developer in mind I can point you to a starting point for this modification.
My Best Regards,