Auto Detect PO Box Shipping Method

Hello – We need to return a shipping method based on if a user enters “PO Box” as a shipping address. We found a code snippet that will disable PO Box delivery. Instead of returning the error “Sorry, we don’t ship to PO BOX addresses.”, could it be customized to select a specific shipping method if the criteria is met?

add_action('woocommerce_after_checkout_validation', 'deny_pobox_postcode');

function deny_pobox_postcode( $posted ) {
  global $woocommerce;
  
  $address  = ( isset( $posted['shipping_address_1'] ) ) ? $posted['shipping_address_1'] : $posted['billing_address_1'];
  $postcode = ( isset( $posted['shipping_postcode'] ) ) ? $posted['shipping_postcode'] : $posted['billing_postcode'];
  
  $replace  = array(" ", ".", ",");
  $address  = strtolower( str_replace( $replace, '', $address ) );
  $postcode = strtolower( str_replace( $replace, '', $postcode ) );

  if ( strstr( $address, 'pobox' ) || strstr( $postcode, 'pobox' ) ) {
    $woocommerce->add_error( "Sorry, we don't ship to PO BOX addresses." );
  }
}

Thanks in advance!