Changing PIR Function After Sunset

Hi all,
I have an issue I'm trying to solve that sounds easy in my head but cannot think of how to implement it without the use of an automation controller which I don't have.
I am trying to achieve the following:
During daylight hours (Outdoor Sunset Switch Inactive) - Bathroom PIR turns on main bathroom lights group.
During nighttime hours (Outdoor Sunset Switch Active) - Bathroom PIR turn on bathroom night light group.

The function is quite simple. PIR to turn on a different group based on the state of the sunset switch. I just don't know how to make this work with the basic CBUS toolkit. Any advice welcomed.

 

What sensor do you have?

Normally you would just set main lights on Motion in light and night light to motion in dark.

 

The bathroom has no windows, so it is always quite dark. Which Is why I want the main lights to trigger during laylight hours. If I set the main lights as motion in light, wont they risk triggering whenever the night light is triggered? The bathroom PIR is a 5753L.