gistfile1.txt

// Change button on all external product links
add_filter( 'woocommerce_loop_add_to_cart_link', function( $html, $product ) {
	if ( 'external' === $product->get_type() ) {
		$html = '<a href="' . esc_url( get_permalink() ) . '/#inquire" class="button">Inquire</a>';
	}
	return $html;
}, 10, 2 );

// Add custom inquire button to all external product pages
add_action( 'woocommerce_single_product_summary', function() {
	global $product;
	if ( 'external' === $product->get_type() ) {
		echo '<a href="#inquire" class="button local-scroll-link">Inquire</a>';
	}
}, 30 );