Well, I've just picked up a couple of like-new TSU9600 remotes, and I was able to port my 9400 control program over to the 9600 platform without losing any functionality. All that was required was modifying the screens to match the new aspect ratio, so a day's work instead of a week's. :)

However, I'm going to leave the WTB request active for now, because I really prefer the form factor of the 9400.