Looks like a couple of Green Mountain boys have a unique answer to the desire to ski on alpine style bindings but still have an efficient touring system. These guys have started up, or at least, are trying to start up, their CAST Binding System.
Basically, it consists of two light weight plates, upon which you mount your alpine binding to. So when you are skiing, you simply step into your alpine bindings and ski away. To tour, you replace the alpine toe piece with a dynafit toepiece (it does require a boot modification), and tour the same way anyone with a tech set up would.
Whether you agree with the concept or not, I have to admit they are at least showing some intuition that may not be possible with binding manufacturers.
From what I can see, and I am not an expert on these, just looking at their website:
requires boot modification (CAST will do this for you though)
you have to carry the tech toepiece in your pack when you ski
you have to carry your alpine toepiece in your pack when you tour
you have to step out of the binding to change between skiiing and touring modes
you tour in alpine boots which for some may not be that comfortable
it adds 7 mm to your binding stack height
Pros: you get to ski in your alpine bindings
you get to ski in your alpine boots (especially great for those who don't like the
fit of an AT boot)
when touring, you aren't lifting the whole binding up like you do with a Duke
if you're skiing and aren't going to tour, then you don't have to carry the tech
it adds 7 mm to your binding stack height (which with a binding like the Head
Mojo, is still lower then a Duke or similar binding)
Here's their websites. Would be interested in what others think.