My first question is can PIR motion sensors be placed in any other pins besides PWMs?
Where did you get the idea that a PIR sensor was read on a PWM pin? PWM is an output capability. It has absolutely nothing to do with how an input pin behaves.
Also the one PIR sensor is particular is to power all the LEDs at a dimmed level, while each LED has their individual PIR to power them at full brightness.
I fail to see how a PIR sensor can power any LEDs. No more than a light switch powers a light on the ceiling. If the switches powered the lights, what would we need the power company for?