I'd recommend heated grips. I was very sceptical before buying: a puny few watts competing with an 80mph blast of air at 0ºC probably wouldn't be noticeable I thought… I was wrong, it does make a difference.
Looking at my fitment again, the guards barely touch the fairing, filing the arrowed bit of the guards allowed me to get them closer to the bar.

It's the mirrors that are the main problem. I even bunged a couple of washers under the rearmost mount to push them a bit further forwards, but they still get pushed about 10mm by the guards. If you have different mirrors: adjustable ones or perhaps the longer-stemmed ones off the 1000cc Fazer there might not be an issue.

I'll stick with mine though, the rearwards view may be crap, but with the amount of filtering I do the narrowness is too useful to lose.
Another option is modifying the fairing mounting so that it's a little further forwards, I've noticed a few people have done that to create a bit more space.