Interesting Idea,
However when you intend to support the same set of synths as Kiwi does, that is not going to work!
Using the BCR-2000 will use only when transferring data in one direction. This is sufficient to support most modern synths.
JX3P: Support by BCR-2000 will work only after modifying the JX3P with the Kiwi processor, which adds some great features when it works, but is very tricky trying yourself (I blew my JX-3P trying it).
Other older synths like Oberheim Matrix series, Sequential Circuits, Waldorf Microwave 1.0 require a midi dialog for transferring these parameters, which is not possible using the BCR. I'm using the Kiwi PE with success on the Oberheim Matrix 6 and Waldorf Microwave 1.0, which works nicely. The Kiwi PE simply has the dedicated transfer protocols for these sets of synths built in.