spacer of about 5-8mm will push the wheel far enough from the hub locator for you to get them on (depend on how big the locator chamfer is on the wheel). then you can look at sorting out a way to make them fit or buying another set of wheels that does fit properly.
I have dremeled a wheel before, its a nasty, tight ass way to do it and i don't recommend it at all. Although you don't see it when the wheel is on, i always know its there.