I do not <think> the ECU (the real ECU, or what you are calling the DFI I think) is going to be the problem with the hardware you have described.
The hinge point of how this is going to go is: Mitsubishi has purposefully made MISTY (the encryption and verification system that Kawasaki uses inside what they call KiPass) ECU inert once there are no more valid fobs available. This is for security purposes (and before the natives get all restless, I am not saying it is good or bad, needed or not, merely that that is what it is). So Mitsubishi has pretty much sewn up swapping the KiPass ECU without any valid fobs and then adding any. BUT, and this is a big but, there is a very slim chance that Kawasaki (not Mitsubishi in their MISTY system) has left a crack you can sneak through IF KiPass will allow the new KiPass ECU to be validated and programmed to work with the ignition switch security system, which is totally separate from the 'other' part of KiPass (the KiPass ECU and associated fobs, ect.) without a valid fob for the KiPass ECU. Now as I said, I kind of doubt this will really work but if it does, then your existing fobs can be used in the RFID mode to satisfy the KiPass ECU, through the CANbus link to the ign. switch. circuitry, that it has been authenticated and then you can program the KiPass ECU itself to recognize new fobs.
What I believe you are going to have to do is though is this: get and install a working ECU acceptable for your year C-14. Get a working KiPass ECU WITH at least one RF fob the KiPass ECU has been programmed to work with and install that. Then use or have someone else use the KDS software to validate all three units on the bike, ECU, KiPass ECU and Ignition switch housing validation circuitry, with each other so that both sides of KiPass, the actual RF ECU as well as the RFID ign. sw. housing circuit can validate the engine control ECU to actually start the bike.
So one of those two descriptions is what you will have to do, and I <think> it is going to be the second one but as I said, three is a chance you <may> be able to authenticate the newly installed KiPass ECU with the existing fob(s) that with authenticate the ign. switch housing security circuit.
KiPass (MISTY) is tough- not like 'dem 'dare wussy NSA, CIA or Credit bureau computers that hackers seem to violate at will.
Brian
I think I understand. The transponder in the SLU will recognize the RF chip inside of my Fobs so I should be able to "unlock" and satisfy that portion of the immobilizer function. What about the used eBay DFI ECU? Wouldn't I still get an error when the KIPASS ECU queries the DFI? That would still leave me with an immobile bike, right? Please tell me I'm wrong, I can take it.