You have two choices:
a) wait for Hans to return from vacation and see if he can let you have the drawing from which you make the owner produced part. It involves cutting two discs, one for each wheel. Then assembling a set of support posts that match the screw locations in your wheel hub. You get the discs powder coated and you have hubcaps;
b) call LoPresti and buy a set of their hubcaps for the Comanche. They are a good product, and the only frustration is that the little spring loaded door that should be above the tire valve isn't located over the valve so you still must remove the hubcap to install air. Otherwise they are a quick installation with an STC at a reasonable price.
Pat