Require Shipping Method Selection In Cart Page

Hi, I want customers to be required to select their shipping method on the cart page before getting to the checkout page. I have been through all of the Woocommerce settings and support documentations but haven’t found what I need.

Basically, they shouldn’t be allowed to hit “Proceed to Checkout” button without choosing a shipping method, which requires them to enter a City and Zipcode. And I don’t want a pre-selected option, because we have a 30 mile delivery radius & a local pickup option. We’d like them to select which type of option first so that way it’s preselected when they get to the checkout page, and they know whether they’re within the delivery radius or not.

Right now, I have a php code that does something similar to what I’d like the final solution to be. It creates a browser popup saying “Please choose Delivery Method before going to Checkout.” This is not ideal for two reasons:
1) The code disables on button click, so if someone clicks “update” on the shipping calculator without inserting real zip code, they are still allowed to go to checkout.
2) The popup feels janky. It doesn’t feel as nice as the default Woocommerce error messages.

Here’s where I got that current code from: https://softound.com/require-shipping-calculator-before-proceed-checkout-woocommerce/

Thanks

Here’s my Woo System Status:

### WordPress Environment ###

WordPress address (URL): https://voixly.space/plants
Site address (URL): https://voixly.space/plants
WC Version: 4.7.0
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WC Blocks Version: ? 3.6.0
Action Scheduler Version: ? 3.1.6
WC Admin Version: ? 1.6.3
Log Directory Writable: ?
WP Version: 5.5.3
WP Multisite: –
WP Memory Limit: 2 GB
WP Debug Mode: –
WP Cron: ?
Language: en_US
External object cache: –

### Server Environment ###

Server Info: LiteSpeed
PHP Version: 7.4.11
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PHP Max Input Vars: 5000
cURL Version: 7.71.0
OpenSSL/1.1.1d

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### Database ###

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WC Database Prefix: wp_
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### Post Type Counts ###

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### Theme ###

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### Templates ###

Overrides: betheme/woocommerce/archive-product.php
betheme/woocommerce/cart/cart.php
betheme/woocommerce/cart/mini-cart.php
betheme/woocommerce/content-product.php
betheme/woocommerce/content-single-product.php
betheme/woocommerce/loop/loop-end.php
betheme/woocommerce/loop/loop-start.php
betheme/woocommerce/loop/no-products-found.php
betheme/woocommerce/loop/pagination.php
betheme/woocommerce/notices/error.php
betheme/woocommerce/notices/notice.php
betheme/woocommerce/notices/success.php
betheme/woocommerce/single-product/add-to-cart/external.php
betheme/woocommerce/single-product/product-image.php
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