Mains powered scene switch

[Crowbar hero]

Hi all,

 

As part of my Home automation build I'm looking for a relatively simple scene switch (for bedrooms primarily) which can be permanently installed on the wall but can control devices via zigbee.  I don't want to be changing batteries all the time, so I want mains powered (or kinetic, but I don't like the price!)  This is part of a rewire so I can pull in an neutral easily enough.

 

(In a typical scenario there'll be 3 channels being controlled: main light, bedside lamp L and bedside lamp R - i'd like to be able to control all 3 from 3 locations, the usual lightswitch point by the door, and on either side of the bed. - I've done this in the past, hardwired with 3 x 3 way intermediate switches, and it's a ball-ache).

I'm seeing lots of scene switches, but very few appear to be mains powered for permanent-install, pretty much all are battery.  Does such a thing exist?