I know that Cinestill used to do this back when they just started out selling Vision3 film for stills use. I assume they contracted out the work to an external business. I don't know how well the process worked; i.e. how clean the result was and if there was any fog due to stray light etc.
In principle, the work is fairly simple; you can refer to the official Kodak literature on ECN2 processing which shows the conceptual design for an ECN2 processing line, which starts with a remjet clearing step. This consists of a remjet clearing bath, jet sprays and a sponge roller to remove the stuff form the back of the film. If you were to do this prior to exposure, you would have to implement this step followed by a wash and then a dryer. The dryer could be a forced hot air dryer much like one used in something like a C41 minilab machine.
In fact, come to think of it, it might be technically possible actually run the film through a C41 minilab and simply replace the developer with a remjet clearing bath and the other tanks with plain water. Perhaps that's the simplest way - provided you can get hold of a C41 processing machine. They pop up here and there, so this might be a feasible approach especially if you have a lot of film to process. Of course the machine would have to be run in a darkroom so as not to expose the film as it exits the machine. And you'd have to make a provision for catching the film at the end and roll it back into cassettes.
