WooCommerce Subscription: custom recurring total on checkout for a switch order with coupon applied

functions.php

// Recurring Total line items
add_filter( 'woocommerce_subscription_price_string', 'wc_subscription_recurring_price_string', 10, 2 );
function wc_subscription_recurring_price_string( $subscription_string, $subscription_details ) {
    if ( ( is_checkout() && ! is_wc_endpoint_url() ) ) {
        $recurring_amount = $subscription_details['recurring_amount'];

		//If this is a switch order with a Specific Coupon applied
    if( WC()->cart->get_total( 'edit' ) == 0.00 && WC()->cart->has_discount( 'COUPON-NAME-HERE' ) && strpos($recurring_amount, '149.00') !== false){
			return  $recurring_amount . ' / 1st year<br>then $199.00 / year';
		} else {
			return $subscription_string;
		}
    }
    return $subscription_string;
}