"One way would be a 1" thread less steerer fork. Not easy to locate bur they do exist. You will then need a 1" threadless headset, those exist but are becoming scarce. Then use a 1" clamp both ends stem, aka threadless, but those are not common with 31.8 bar clamp.
Quite a bit to spend, unless you love the bike."

Not necessarily. Nashbar.com has a well reputed carbon fork with 1" threadless steerer for $99, plus a 1" threadless headset for less than $20. Currently 20% off with free shipping - all costs less than $100. Not too bad. Thinking of doing it myself right now.