I've run into that problem. The solution is simple in theory, a bit more difficult in practice: there's a tube-shaped spacer that slides onto the axle before the freehub body. You need to remove the freehub body (just pull hard on the cassette) and add a very thin spacer that effectively makes that tube just a hair longer, just enough to get the cassette to stop hitting the spokes.
Finding such a spacer will be the tricky part. When I'm at work tomorrow, I'll try to remember to rummage for one that'll do the trick; if I do, I'll let you know and mail it to you.
One might think "hey, I'll just add a spacer between the cassette itself and the cassette body" but this results in the small cog clinging by a hair to the cassette body, not a workable solution if you plan to apply meaningful amounts of power.