I'm probably missing something here, but couldn't you use the Caddy calipers that people use in the back for disc swaps. Might need 8 lug stuff up front, if you don't already have. Probably wouldn't work very well as a cutting brake either. But would do ok as a holding brake. I don't see any reason why you couldn't find a flexible enough cable to use either.
Edit; nevermind my sugestion, didn't see you were running a 60. Although you could downgrade to 3/4ton size rotors/calipers and possibly make it work.