Custom Product Form - Only Need it Once

Site URL: https://www.ballonafriends.org/

My organization's website is selling two very different types of products, t-shirts and weeks of nature camp. For the nature camp purchases, we need the registration information for each camper and originally, when different weeks of camp were the only product sold, we had a custom check out form to capture the needed registration information. With shirts now sold, we were hoping a custom product form would work. But if multiple weeks of camp are added to the cart, we don't want to force a person to fill out the custom product form for each week of camp they add to the cart. Is there a way to have the form required for the first week added but not for additional weeks purchased? Or is there a way to have a different check-out form based on the items in the cart?