The bar doesn't need through the bar safety as it has a spinning leash setup on it. Personally I would prefer through the bar as it is simpler and there is no leash dangling around. It would require a simple mod.
Basically the best thing to do is look at as many bars as you can and then see which parts you like and order them from companies to make your own custom bar.
I don't see why there aren't any custom bar companies out there, it seems there is a need for them....
I agree that it would be super to have a custom bar company out there. Just like JayFactory did with the spreader bar when they introduced the Dynabar ... make something better than the stock stuff that exists now. A customized bar with replaceable parts would be super.