I would suggest to keep it simple, and not change to custom ports. If you update the JSON properties, I think the customer ports is possible. But in security, the key is to keep things simple. The more complex, the harder to maintain over time. If you are worried about port conflicts, perhaps use a "virtual ethernet interface" on the server instead. You can overload one ethernet interface with more then one IP adresss, and this will enable you to re-use the 443 port on the same ethernet interface.