Have you tried asking tech@konaworld.com ? Be forewarned though that Tech sometimes lapses from his usual laid-back/laconic into a wierd kind of safety-consciousness, where he might just tell you that it would void your warranty, but .... and then advise you what to do.
Actually you could do a search on konaworld.com forum and you may find somebody has asked the question before.
Well set up V's (or canti's) are a match for any disk most of the time, and cheap or old disks can be worse.
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Argos Cycles in Bristol did the work for me. Top chaps. I had the disc tab added (inc brace), canti studs removed, hydro hose clips added then resprayed and re decaled.