Hong Kong landing and plane change is just fine and you can enjoy 144 hours visa free transit in Shanghai, but one additional condition should be fulfilled. This condition is that your cruise from Shanghai should not have any port call immediately after your departure from Shanghai at one of mainland Chinese ports or in Hong Kong. It is just fine to visit Hong Kong, but after you have visited at least one port in let's say South Korea or Japan.

You can do 144 hour transit without Visa in Shanghai as long as the next port is not Hong Kong or another Chinese port