Manual Affiliate ID Entry

Hello,
I am considering to buy the business version for the affiliate feature, but I have a question first. Would it be possible for me to add an input box (similar to the coupon input box), where the customer would enter the affiliate ID at the time of checkout?

My sales team doesn't have a webpage to link from. Instead, they will have an ID printed on their business card. Therefore, the customer will have to type number. Then when the customer hits the "add" button, it will bring up the affiliate's name to confirm that the correct ID number was typed.

I understand this will take some programming, but do you think this will be possible with the Hikashop infrastructure?

Thanks!
Emily