Not sure if any classic and vintage bike rebuilders have considered this or not but I am intrigued at the idea of running a titanium stem on several of my 1990's/early 2000's era aluminum roadbike builds I'm working on. One of them the Klein Quantum has a 1" straight steerer and I have outfitted this with a really nifty ti aheadset type stem that accepts 31.8 bars. This part was less than $100 and really looks great with a matching ti seatpost.

The custom one I just ordered is for a Cannondale Six13 that I am working on. It will have Deda Trentacinque 35.0 bars so I need the titanium builder to do the custom option. They say they are willing to do it for me and the price is $135. If the quality of the finished product is anything like what I got in the 1" aheadset stem, I'm gonna be stoked.