Dave, thanks. Yes, my intention is to either cut the steerer below the threads. I'm going to check out both local bike shops after work to see if they have 1" threadless headset parts. I really don't want to spend 30-40 bucks on a new headset at this point (especially in such an uncommon size) until I figure out the final setup.

Should I need to measure the diameter of my head tube, or should any 1" threadless setup work? This one on eBay is far and away the least expensive option (and is even cheaper than just buying the star nut and cap separately). I'm not a weight weenie, so a steel headset is just fine. Should this one work? For 10 bucks, I'll just do this instead of trying to cobble together other parts.