I’m a little confused by your description, but the switch for the porch lights only turns the porch light on and off, right? Nothing else?
If so, the easiest thing is just to put a baby lock over that switch just to remind people not to use it (but it would still be available in an emergency). That’s what we do with our own porch light. These come in many different styles and prices and are available at any hardware store. The one we used cost about 80 cents but you can get much fancier ones for more money if you prefer. 
Alternatively, there are a couple of smart switch covers which can go over the existing switch and are battery operated. That way you still have a switch that people can use but it won’t actually cut the power. These work well, they just cost more when you might not need them for your use case.
See the FAQ on switches to use with smart bulbs and it should give you some ideas. (This is a clickable link)
Yet another alternative is to get one of the switches that work without a neutral, like Lutron Caseta, and we can talk about those options if you’re interested. But they won’t look like the switch that they are next to and they require their own bridge device, so I think would be overkill for this particular setup.