RG,
Sounds like you are on the way to the conversion now. What about one of the intermediate cage ders that are out, not as long as the LC ders but still more take up. I have seen some DF bikes with the SRAM WiFli drive using this configuration. Just a thought, you know far more than I do about the Ketts, that is a different animal from what I am used to working on. Pics of the conversion when it is finished if you would, please.
Bill
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Semper Fi, USMC, 1975-1977
I Can Do All Things Through Him, Who Gives Me Strength. Philippians 4:13