Yes, i've done it on my 200 and it worked a treat, i've just removed the kit on my 300 so need to fashion up a frame to mount the fans on.
On a 200, the fans are separate to the aircon rad so its much easier. There is also a back up sensor in the coolant, so if for any reason your coolant isnt cooling sufficiently, the aircon fans will kick in automatically and start bringing things under control. I've ran my 200 like this for over 5 years, on road and off, heavy towing and empty. Works a treat.
I'm assuming that there is a back up in the system of a 300 as well, but the aircon fans are attached to the aircon rad, so a wee bit of lateral thinking to get it set up will be required.
Mine already has an electric fan fitted by the previous owner, so the aircon ones will just be to back that up on the hottest of hot days etc.