I agree with Alexandre. If there were a way to export to an XML document that essentially only describes each node's position/options/connections that would be plenty sufficient. And interface wouldn't even be entirely necessary as I'm sure others can create something. The WatchMaker app does something similar, and it didn't take long for someone to create a Java applet to edit them on PC.
That being said, I completely understand that there may be much more involved here that meets the eye!