Frame challenge.   What you want is 1 switch to activate all the lights, and that's making people chase expensive obscura, and proposing marginally-Code solutions.  **What is easy is 2 switches to activate all the lights**. 

Blow out the motion sensor box to a 2-gang box.  One gang gets the motion sensor.  The next gang over gets a plain switch.  

It's already true that the motion sensor gets **always-hot**.  Extend/pigtail that so the plain switch also gets it.  

Ditto ditto ditto, **switched-hot**.  

Now, the switch at the motion sensor will override the motion sensor.  

Note that if the motion sensor does not have a neutral, this will make the motion sensor lose power.  That may wipe out its memory of normal day/night light levels in this location.  So you might see some "motion sensor turning on lights in daylight" behavior for a day or two after overriding it.  If you don't like that, get a motion sensor with a neutral.