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Join Date: Feb 2006
Location: Sin City, Nevada
Posts: 2,885
Bikes: Catrike 700, Greenspeed GTO trike, , Linear LWB recumbent, Haluzak Horizon SWB recumbent, Balance 450 MTB, Cannondale SM800 Beast of the East
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This is probably going to be a difficult task. Challenge has been gone for a while. The website shows a 2012 date at the bottom of the home page. You might contact the two dealers who sold them in the US. Both are still around - Angletech Cycles in Woodland Park CO and Recumbent Bike Riders in State College PA. They could probably tell you if the conversion is possible.
I own two recumbent bikes that use USS. The "stick" mentioned above is a tie rod. It attaches to a ball on the front fork and another at the USS. Getting parts might mean buying both the handlebar assembly, the tie rod, and a new front fork, Even if available, this would be expensive.