Switching zwave with KAku switch

[jjk88]

I'm starting to change all my KaKu buildin dimmers and switches to z-wave, but I like to keep my Kaku wall buttons in use to switch the zwave actors.
Now I hoped to do so by just adding slave characteristics to the wall buttons.
But after some forum searches and reading the manual more carefullyi found out that the sub/slave function does'nt actually switch an actor but only changes the state in the webinterface.

What i was hoping for is a quicker and easyer way to attach the kaku switch to a zwave actor.
Is there any except a script or blockly?