Cool idea.
You might be better served by buying one of the Rennbay new-production power shafts and modifying that.
As an idea, I know that some VW and other cars use a two-piece shaft (inner shaft and outer shaft) that collapses for crash safety...the two pieces are locked together by a plastic rivet, strong enough for normal steering operation but shears off in case the shaft gets collapsed in a crash.
There has been a lot of clamoring for new-production manual steering shafts (the same as the PS shaft but about an inch longer) but not quite enough demand for Rennbay to run production...but maybe you could fill that gap.
...and then it could be carried by Pelican...
