I suppose you could by getting something like wood planks and bungee cording them to the front tire. But it may be hard to find just the right thickness. of course it wouldn't have to be exact. They probably be best when they make the front a tad wider than the rear. I don't see the problem tho with the rear being much wider. The measurements on the front tire should be just as easy to do if it's 2 or 3 inches vs say a inch.
As for exhausts or anything else in the way, i haven't looked at it and sized that consideration up yet, but worse comes to worse i'll remove them. I also think once i have the wheel dead on i am going to make my own markings on the swingarm so that i CAN use them since the stock marks are off. That way i'll only have to do the string alignment once.