Move cart/checkout items to a different store

Hi, I would like to know if there’s a way to move items that are in cart or checkout to a different store. For example, customer is shopping on Shop A, adds products to cart, goes to checkout, but sees that their shipping country is not on the list, clicks a button which moves all his items to Shop B, which is on a different domain or subdomain, but serves customers country. Products on Shop A and Shop B are identical.