I'm guessing the interchangeable handle bit is the way the razor has been designed from the pic's i've seen of it being taken apart the handle will not be fixed to the head so it should allow for a different handle to be used but as the adjustment markings are on the handle this will be an issue unless they are willing to make handles of different length...
That's kind of what I got out of it. They would be the ones to make the different length handles like the Merkur Progress (except you just need to buy a handle instead of another razor) and so I could not use my favorite Ikon 90mm on it.