you're in luck. here are cell phone pics of my car with the OEM style splitters test fitted from long ago. we didn't use any adhesive, just slipped them on, so these aren't really a good indication of fitment, but should be enough for what you're looking for.
now I'm running a hamann lip, that I wrapped in CF vinyl:
http://www.e90post.com/forums/showthread.php?t=381938
so I say go for it! CF will look good with monaco.