Hide WooCommerce subscriptions text (in product and cart pages) from products with a set Price but no Subscription Fee

functions.php

// Define which products we should hide the subscription text for
function should_hide_subscription_text($product){
    $is_subscription = (get_class($product) == 'WC_Product_Variable_Subscription');
    $has_price = (intval($product->subscription_price)>0);
    $has_fee = (intval($product->subscription_sign_up_fee)>0);
    if($is_subscription && $has_price && !$has_fee){
        return true;
    } else {
        return false;
    }
}

function custom_subscriptions_product_price_string( $pricestring, $product, $include ) {
    global $product;
    if ( should_hide_subscription_text($product) ) {
        $pricestring = str_replace( '<span class="amount">&#36;0.00</span>', '<span class="amount">&#36;'.$product->subscription_price.'</span>', $pricestring );
        $pricestring = str_replace( 'for 1 month', '', $pricestring );
        $pricestring = str_replace( 'and a', '', $pricestring );
        $pricestring = str_replace( 'sign-up fee', '', $pricestring );
        $pricestring = str_replace( 'month for', '', $pricestring );
        $pricestring = str_replace( ' / ', '', $pricestring );
        $pricestring = str_replace( 'Free!', '', $pricestring );
        $pricestring = str_replace( ' months ', ' months for ', $pricestring );
    }

    return $pricestring;
}
add_filter( 'woocommerce_subscriptions_product_price_string', 'custom_subscriptions_product_price_string' );

// Remove bad subscription stuff from cart
function wc_subscriptions_custom_price_string( $pricestring ) {
    $pricestring = str_replace( '<span class="amount">&#36;0.00</span>', '', $pricestring );
    $pricestring = str_replace( '/ month for ', '', $pricestring );
    $pricestring = str_replace( ' and a ', ' for ', $pricestring );
    $pricestring = str_replace( ' sign-up fee', '', $pricestring );
    return $pricestring;
}
add_filter( 'woocommerce_subscriptions_product_price_string', 'wc_subscriptions_custom_price_string' );
add_filter( 'woocommerce_subscription_price_string', 'wc_subscriptions_custom_price_string' );