Thanks for the tip. I'll probably go with weatherizing an indoor rated sensor, and maybe give the AeoTec a shot. I had seen a way to rewire a non-smart home motion sensor to a HA door sensor, but I'm not convinced that the DIY would be efficient for how many sensors and zones I'll eventually be deploying.
Are there any recommendations for outdoor cameras on the market now that allow for zones in the image to be motion triggers for HA? Cameras are eventually in the works, so it may be more efficient in the end to go that route. When I was doing contract security, we had camera systems with that capability, but that company is crazy expensive to the point that they probably wouldn't even take my phone call. But was years ago, so I figure it's only a matter of time before it becomes feasible for the HA market.