I have a set of hallway lights with two 3-Way switches. Currently the power source enters at one switch, then the wiring traverses through each of the lights and then terminates at the other switch (see 1st image). What I want to do is change the switch at the end of the hallway to a motion sensor and make the other switch a master ON (in Off position the motion sensor would determine state of lights).
The motion sensor requires a neutral which does not exist in that box currently. I think the below diagram would work (2nd image), but not sure it would be compliant. Once concern is that it would be possible for the lights to receive power from both the normal switch and the motion sensor switch at the same time. Would that be a problem? Thank you in advance!
EDIT: The reason I want to use the normal switch as a master ON is because there is a treadmill in that area and using it does not consistently trigger a motion sensor. I want the motion sensor for people walking in that area and the other switch to turn On indefinitely while using the treadmill.