Remove "Add to Cart" button and replace it with a "Request Quote" button based on the user's location.

functions.php

if ( is_plugin_active( 'woocommerce/woocommerce.php' ) ) {
	// WooCommerce plugin is active class is loaded

	function replace_add_to_cart_button() {
		// Output the "Request Quote" button
		echo '<a href="/contatti/" class="request-quote-button single_add_to_cart_button button alt wp-element-button">Richiedi un preventivo</a>';
		return;
	}

	if (! class_exists( 'WC_Geolocation' ) ) {
		require_once( WP_PLUGIN_DIR . '/woocommerce/includes/class-wc-geolocation.php' );
	}
	// Get an instance of the WC_Geolocation object class
	$geo_instance  = new WC_Geolocation();

	// Get geolocated visitor geo data.
	$visitor_location = $geo_instance->geolocate_ip();
	$visitor_country = $visitor_location['country'] ?? false;

	// List of countries to show request quote button instead of add to cart.
	$countries = array("GB", "CH", "AL");

	// Check if visitor is from one of the specified countries
	if ( in_array( $visitor_country, $countries ) ) {
				
		// Remove the add to cart button
		add_filter( 'woocommerce_is_purchasable', '__return_false');

		//add_filter( 'woocommerce_loop_add_to_cart_link', 'replace_add_to_cart_button', 10, 2 );
		add_action( 'woocommerce_after_shop_loop_item', 'replace_add_to_cart_button', 20 );
		add_action( 'woocommerce_single_product_summary', 'replace_add_to_cart_button', 30 );
	}
			
}