@RickMeister 

no.  No way to mimic the travelers. Look for a 2 way sensor family that has a "companion" remote switch.  Leviton has something, so dos Tapo

  @RickMeister 

First they're not 3-way switches, which means no traveler line. Second, i don't think one traveler line can be left alone in a 3-way circuit. 

@RickMeister 

You may be able to accomplish this using Kasa "Smart Actions" and some outside of the box thinking.  Cap the load wire, so the sensor doesn't physically trigger anything.. Program a Smart Action to turn on any other switch when motion is detected.

With two .motion sensors, if you have or can pass neutral to both ends, you could wire them to work in parallel.  This is only ideal for side entrances.. or where there's  no need to manually switch on off.. purely motion on off.