You searched and found nothing? Strange, I found at least three threads, almost immediately, with your exact same problem. 
Work on your Google-Fu:
Emulated IR problem - Mac
[FIX] Use Mouse as Wiimote [Mac OS X]
Emulated wiimote cursor /pointer on a Mac
Apparently, given the answer was the same in all three threads, it doesn't look like it's possible with OS X right now.
Work on your Google-Fu:Emulated IR problem - Mac
[FIX] Use Mouse as Wiimote [Mac OS X]
Emulated wiimote cursor /pointer on a Mac
Apparently, given the answer was the same in all three threads, it doesn't look like it's possible with OS X right now.