move-advance-shipping-to-top.php

add_filter( 'woocommerce_package_rates', function (  $rates ){

	$match = 'pisol_extended_flat_shipping';
	$our_rate = [];

	foreach ( $rates as $rate_id => $rate ) {
		if(strpos($rate_id, 'pisol_extended_flat_shipping') !== false){
			$our_rate[$rate_id] = $rate;
			unset($rates[$rate_id]);
		}
	}

	if(!empty($our_rate)){
		return array_merge($our_rate, $rates);
	}

	return $rates;
}, PHP_INT_MAX );