With no native plugin support with the indie license i decided to create a workaround.
It basically consists of OSCulator sending OSC messages to unity over UDP and my little wrapper that parses these OSC messages.
As OSCulator supports multiple wiimotes and Balance Boards so does my little wrapper.
As of version 1.2, Nunchucks, Classic Controllers, Motion plus, vibration, LED and motion plus recalibration support has been added.
Only problem is that with the unregistered version of OSCulator, sending is blocked while "nagging screen" is shown :S (happens around every 10 minutes).
GlovePIE for windows might be a viable alternative for the ones not running OSX.
Edit: The source is uploaded and can be found here: http://itu.dk/people/jzso/OSCuMote/oscumote.html