Fun? Since when has bivying in winter been fun? And why the hell, by the way, are you going "bivoacing?" I didn't realize "bivoacing" was a sport unto itself. Usually bivying is the unfortunate side effect of climbing mountains.
That's like saying, "I'm not going to go play soccer, but perhaps you could just kick me in the shins and knee me about the balls a few times, you know, just for FUN."