Comical, yes, but -- dude, that'd be cool! It'd be like a "docking station"; when you need it tiny and handheld, pluck it from the dock and go. When you need the shoulder-mount stability and bigger form factor, plug it back in.
If one of the majors (Panasonic, JVC, Sony or Canon) made a "convertible" like that, with the basic pro features (real manual control of iris, shutter, focus, gain), I'd give it a look.