Zigbee/Z-Wave relay with 12-48VDC input (power supply) for switching 230VAC

I am wondering if there are any Zigbee or Z-Wave relays with VDC input switching 230V output.
Thing is that I have no neutral cable in my light switches but I have cat5 eth cable there. So I wonder if there are any Zigbee modules which I can put under my flush mounted switches, power these with for example 24VDC via cat5 (or any other safe VDC) and switch/control 230VAC lights line.