3-way dimmer with "Power into Light" configuration

This sounds like my scenario. I have 3, 3 ways, each has line in one box and neutral in the other.

Placement of load switch is important. Needs to be in the “other” box, not the box that the line comes in on. Otherwise turning off the light, also turns off the “auxiliary” switch.

You can use this device handler to set up zwave association. Then once setup, set device handler back to “dimmer switch” so everything runs local.