How to Reverse the Billing and Shipping Functionality in “Ship to a different address?” in WooCommerce Checkout?

I want to modify the WooCommerce checkout process and reverse the behavior of the “Ship to a different address?” checkbox. Here’s how it currently works in the classic checkout:

When the checkbox is checked:
The shipping form becomes visible, allowing the customer to fill in shipping details.
When the checkbox is unchecked:
The shipping form is hidden, and the customer’s shipping address is automatically set to match the billing address.

**What I want to achieve is the exact opposite:
**
Change the text of the checkbox to “Different billing address?”.
When the checkbox is checked:
The billing form should become visible, allowing the customer to fill in billing details.
When the checkbox is unchecked:
The billing form should be hidden, and the customer’s billing address should automatically be set to match the shipping address.


If reversing this functionality is too complicated, do you think it would be better to create a new checkbox field on the checkout page to handle these conditions, or should I continue down the path of modifying the existing functionality?

Notes:
In the new block-based checkout, this functionality already works as intended.
However, I need to achieve this specifically in the classic checkout.
Any advice or alternative solutions would be greatly appreciated!

I inspected the core checkout.min.js file and found the relevant function:

javascript
Kodu kopyala
update_checkout_action: function (t)
// Core WooCommerce functionality
}
I believe I can achieve this by modifying this function, but I’m wondering if there’s a better or more standard way to implement this change. Surely, with WooCommerce being around for so long, there must be a cleaner solution.