I suppose you could always set up the PIR to pick people up before they reach the property so the cameras has time to adapt.
The other thing you could do is have a dusk to dawn sensor on a light and fit the light fitting out with an LED daylight bulb. That way it switches on at dawn and off at dusk without any intervention. I have a rear light at my property that does that, albeit it's only a 4W led. There's another 35W of LED floodlight on a PIR as well though. (A 4w led wouldn't be enough to make a huge difference to your cameras). Another alternative could be around a 30W LED floodlight on the dawn to dusk. For 6-12 hrs per day depending on the time of year, they're not going to cost a fortune to run. That said, if it were my electricity bill, even at 30W, I'd rather have it sensor-ed.
If you can get it light enough, a 4K camera is going to give better definition. Maybe the answer is a starlight + a 4K + lighting.